ShakirShaikh ShakirShaikh

19-03-2021
Mathematics

contestada

show that (3x+7)² -84x = (3x-7)

Respuesta :

crimsonorchid crimsonorchid

19-03-2021

First expand...

(3x+7)^2 = 9x^2+42x+49

Bring down -84x...

9x^2+42x+49-84x

Solve...

9x^2-42x+49

Factor...

(3x-7) (3x-7) = (3x-7)^2

Answer Link

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