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use the quadratics formula to solve (3x + 2)^2 - (8 * 9) = -4x

 Apr 7, 2022
 #1
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(3x + 2)^2 - (8 * 9) = -4x           expand L side

9x^2 + 12x + 4   - 72 = - 4x       simplify

9x^2 + 16x -68 = 0

 

a = 9      b = 16       c = - 68

 

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

 

\(x = {-16 \pm \sqrt{16^2-4(9)(-68)} \over 2(9)}\)       Plug and chug !

 Apr 7, 2022
 #2
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thanks

Guest Apr 7, 2022

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