Maths-
General
Easy

Question

Find the solution of the system of equations.
y equals x squared plus 8 x plus 30
y = 5 - 2x

hintHint:

The expansion of the identity (x + a)2 = x2 + 2ax + a2. A polynomial of degree two has at most two real solutions.
We are asked to solve the set of equation.

The correct answer is: We are asked to solve the set of equation.


    Step 1 of 3:
    The LHS of the given set is equal. Thus, equate the RHS of the equation.
    table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell x squared plus 8 x plus 30 equals 5 minus 2 x space space space space space space end cell row cell x squared plus 8 x plus 2 x plus 30 minus 5 equals 0 end cell row cell x squared plus 10 x plus 25 equals 0 space space space space space space space space space space space space end cell end table
    Step 2 of 3:
    Solve the solution for the variable x:
    table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell x squared plus 10 x plus 25 equals 0 space space space space space space space end cell row cell x squared plus 5 x plus 5 x plus 25 equals 0 space space end cell row cell x left parenthesis x plus 5 right parenthesis plus 5 left parenthesis x plus 5 right parenthesis equals 0 end cell row cell left parenthesis x plus 5 right parenthesis left parenthesis x plus 5 right parenthesis equals 0 space space space space space space space space space end cell row cell left parenthesis x plus 5 right parenthesis equals 0 straight & left parenthesis x plus 5 right parenthesis equals 0 end cell row cell x equals negative 5 space space space space space space space space space space space space space space space space space space space space space space space space space space end cell end table
    The multiplicity of the value is two.
    Step 3 of 3 :
    Substitute the value of  in any of the equation to get the value of y,
    when x = -5,
    y equals 5 minus 2 x space
y equals 5 minus 2 left parenthesis negative 5 right parenthesis
space y equals 5 plus 10
space y equals 15
    Thus, the  solution of  the set of equation is (-5, 15).

    The  multiplicity of a value is the number of time is repeat itself.

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