math

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81y4 - 16

i know its A2 – b2 = (a-b)(a+b) but i cant figure it out

• math -

helpppppppp

• math -

When writing online, x^2 = x squared.

(9y^2 - 4)(9y^2 + 4) = (3y - 2)(3y + 2)(9y^2 + 4)

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