Maths-
General
Easy

Question

Find the extraneous solution of square root of 8 x plus 9 end root equals x
 

hintHint:

Rearrange the equation and then solve for x.

The correct answer is: ⇒ x = -6


    Complete step by step solution:
    Here we have the equation square root of 24 minus 2 x end root equals x
    Now, on squaring both the sides, we get left parenthesis square root of 24 minus 2 x end root right parenthesis squared equals x squared

    not stretchy rightwards double arrow 24 minus 2 x equals x squared
    On rearranging, we have x squared plus 2 x minus 24 equals 0
    Now, this is a quadratic equation with a = 1, b = 2, c = -24
    Roots can be found with, x equals fraction numerator negative b plus-or-minus square root of b squared minus 4 a c end root over denominator 2 a end fraction

    x equals fraction numerator negative 2 plus-or-minus square root of 4 minus 4 cross times 1 cross times negative 24 end root over denominator 2 cross times 1 end fraction
    On solving, we get x = -6,4
    Here, on substituting x = -6 or 4 in given equation we get

    square root of 24 minus 2 cross times negative 6 end root equals negative 6
    not stretchy rightwards double arrow square root of 24 plus 12 end root equals square root of 36 not equal to negative 6
    Hence x = -6 does not work.

    Now, square root of 24 minus 2 cross times 4 end root equals 4
    not stretchy rightwards double arrow square root of 24 minus 8 end root equals square root of 16 equals 4
    Hence x = 4 works.
    Hence x = -6  is an extraneous solution.

    Related Questions to study

    General
    Maths-

    Explain the similarities between rational numbers and rational expressions ?

    Explain the similarities between rational numbers and rational expressions ?

    Maths-General
    General
    Maths-

    Simplify the following expression.
    open parentheses fraction numerator 2 x minus 1 over denominator x plus 3 end fraction minus fraction numerator x squared minus 4 over denominator 2 x plus 1 end fraction close parentheses space cross times space fraction numerator 2 x squared plus 7 x plus 3 over denominator x plus 2 end fraction

    Simplify the following expression.
    open parentheses fraction numerator 2 x minus 1 over denominator x plus 3 end fraction minus fraction numerator x squared minus 4 over denominator 2 x plus 1 end fraction close parentheses space cross times space fraction numerator 2 x squared plus 7 x plus 3 over denominator x plus 2 end fraction

    Maths-General
    General
    Maths-

    Sketch the graph of y equals fraction numerator negative 3 over denominator 4 end fraction x plus 2

    Sketch the graph of y equals fraction numerator negative 3 over denominator 4 end fraction x plus 2

    Maths-General
    parallel
    General
    General

    Explain how you can use your graphing calculator to show that the rational  expressions fraction numerator negative 6 x squared plus 21 x over denominator 3 x end fraction and
    negative 2 x plus 7are equivalent under a given domain. What is true about the graph
    at x = 0and Why?

    Explain how you can use your graphing calculator to show that the rational  expressions fraction numerator negative 6 x squared plus 21 x over denominator 3 x end fraction and
    negative 2 x plus 7are equivalent under a given domain. What is true about the graph
    at x = 0and Why?

    GeneralGeneral
    General
    Maths-

    If A equals 2 x cubed plus 5 x squared plus 4 x plus 1 text  and  end text B equals 2 x squared plus 3 x plus 1 then find the quotient from the following four option, when A is divided by B.

    If A equals 2 x cubed plus 5 x squared plus 4 x plus 1 text  and  end text B equals 2 x squared plus 3 x plus 1 then find the quotient from the following four option, when A is divided by B.

    Maths-General
    General
    Maths-

    Find the extraneous solution of square root of 8 x plus 9 end root equals x
     

    Find the extraneous solution of square root of 8 x plus 9 end root equals x
     

    Maths-General
    parallel
    General
    Maths-

    Explain why the process of dividing by a rational number is the same as multiplying by its reciprocal.

    Explain why the process of dividing by a rational number is the same as multiplying by its reciprocal.

    Maths-General
    General
    Maths-

    Sketch the graph of y = 2x - 5.

    Sketch the graph of y = 2x - 5.

    Maths-General
    General
    Maths-

    Simplify each expressions and state the domain : fraction numerator x squared plus 2 x plus 1 over denominator x cubed minus 2 x squared minus 3 x end fraction

    Simplify each expressions and state the domain : fraction numerator x squared plus 2 x plus 1 over denominator x cubed minus 2 x squared minus 3 x end fraction

    Maths-General
    parallel
    General
    Maths-

    Reduce the following rational expressions to their lowest terms
    fraction numerator 8 x to the power of 5 minus 8 x over denominator open parentheses 3 x squared plus 3 close parentheses left parenthesis 4 x plus 4 right parenthesis end fraction

    Reduce the following rational expressions to their lowest terms
    fraction numerator 8 x to the power of 5 minus 8 x over denominator open parentheses 3 x squared plus 3 close parentheses left parenthesis 4 x plus 4 right parenthesis end fraction

    Maths-General
    General
    Maths-

    Describe the error student made in multiplying and simplifyingfraction numerator x plus 2 over denominator x minus 2 end fraction cross times fraction numerator x squared minus 4 over denominator x squared plus x minus 2 end fraction

    Describe the error student made in multiplying and simplifyingfraction numerator x plus 2 over denominator x minus 2 end fraction cross times fraction numerator x squared minus 4 over denominator x squared plus x minus 2 end fraction

    Maths-General
    General
    Maths-

    The LCM of the polynomials 5 open parentheses x squared minus 2 x close parentheses left parenthesis x minus 6 right parenthesis squared straight & 2 x open parentheses x squared minus 4 close parentheses left parenthesis x minus 6 right parenthesis squared is.

    The LCM of the polynomials 5 open parentheses x squared minus 2 x close parentheses left parenthesis x minus 6 right parenthesis squared straight & 2 x open parentheses x squared minus 4 close parentheses left parenthesis x minus 6 right parenthesis squared is.

    Maths-General
    parallel
    General
    Maths-

    Write the equation in slope-intercept form of the line that passes through the points (5, 4) and (-1, 6).

    The slope intercept form is y = mx + b, where m represents the slope and b represents the y-intercept. We can draw the graph of a linear equation on the x-y coordinate plane using this form of a linear equation.
    Steps for determining a line's equation from two points:
    Step 1: The slope formula used to calculate the slope.
    Step 2: To determine the y-intercept, use the slope and one of the points (b).
    Step 3: Once you know the values for m and b, we can plug them into the slope-intercept form of a line, i.e., (y = mx + b), to obtain the line's equation.

    Write the equation in slope-intercept form of the line that passes through the points (5, 4) and (-1, 6).

    Maths-General

    The slope intercept form is y = mx + b, where m represents the slope and b represents the y-intercept. We can draw the graph of a linear equation on the x-y coordinate plane using this form of a linear equation.
    Steps for determining a line's equation from two points:
    Step 1: The slope formula used to calculate the slope.
    Step 2: To determine the y-intercept, use the slope and one of the points (b).
    Step 3: Once you know the values for m and b, we can plug them into the slope-intercept form of a line, i.e., (y = mx + b), to obtain the line's equation.

    General
    Maths-

    What is the simplified form of the rational expressions ? What is the domain for which the identity between the two expressions is valid ?
    fraction numerator x cubed minus 5 x squared minus 24 x over denominator x cubed plus x squared minus 72 x end fraction

    What is the simplified form of the rational expressions ? What is the domain for which the identity between the two expressions is valid ?
    fraction numerator x cubed minus 5 x squared minus 24 x over denominator x cubed plus x squared minus 72 x end fraction

    Maths-General
    General
    Maths-

    Explain fraction numerator 4 x squared minus 7 over denominator 4 x squared minus 7 end fraction =1 why   is a valid identity under the domain of all real numbers except plus-or-minus fraction numerator square root of 7 over denominator 2 end fraction.

    Explain fraction numerator 4 x squared minus 7 over denominator 4 x squared minus 7 end fraction =1 why   is a valid identity under the domain of all real numbers except plus-or-minus fraction numerator square root of 7 over denominator 2 end fraction.

    Maths-General
    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.