Question

(3x-4)(3x+4)-9(x-4)^2=-16

Answer 1

(3x-4)(3x+4) - 9(x-4)^2 = -16

9x^2 - 16 - 9(x^2 - 8x + 16) = -16 

9x^2 -16 - 9x^2 + 72x - 144 = -16

72x = -16+16+144

72x = 144  /:72

x = 2

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