usmarine4life44 usmarine4life44

21-04-2017
Mathematics

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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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Respuesta :

21-04-2017

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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