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7 September, 22:20

Solve by using the square root method.

4x2-8=136

Question 3 options:

{-2, 2}

{-6, 6}

{-12, 12}

{-144,144}

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Answers (1)
  1. 8 September, 00:08
    0
    4x^2-8=136 subtract 136 from both sides

    4x^2-144 ... this is a difference of perfect squares so

    (2x+12) (2x-12)

    x=±6 or as they put it:

    {-6, 6}
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