Question

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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Answer 1

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}