Mathematics
Grade10
Easy

Question

Find the solution of quadratic equation 7 x squared plus 15 equals 50 using square roots

  1. x equals plus-or-minus √ 13
  2. x equals plus-or-minus √ left parenthesis 13 divided by 2 right parenthesis
  3. x equals plus-or-minus √ left parenthesis 65 divided by 7 right parenthesis
  4. x equals plus-or-minus √ 5

The correct answer is: x equals plus-or-minus √ 5


    7 x squared plus 15 equals 50
    Subtracting 15 on both the sides,
    7 x squared plus 15 minus 15 equals 50 minus 15
    7 x squared equals 35
    x squared equals 35 divided by 7
    x squared equals 5
    Taking square root on both the sides of the equation, we get
    √ left parenthesis x squared right parenthesis equals plus-or-minus √ 5
    x equals plus-or-minus √ 5

    Related Questions to study

    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.