erika40 erika40

30-01-2017
Mathematics

contestada

completely factor the following expression 9x^2-36

Respuesta :

30-01-2017

Look at perfect square factoring: x²-b ⇒ (x-b)(x+b)
√9=3
√36=6
√x²=x
knowing that:
(3x+6)(3x-6)

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