What is the standard form of $y(8y + 5)(8y - 5)$ ?

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Answer 1 · 2016-12-08T23:57:19

#64y^3 - 25y

First, cross multiply the terms in parenthesis:

$y((8y*8y) - (5*8y) + (5*8y) - (5*5))$

$y(64y^2 - 40y + 40y - 25$

$y(64y^2 - 25)$

Then distribute across the terms in parenthesis:

$64y^2y - 25*y$

$64y^3 - 25y$

What is the standard form of y(8y + 5)(8y - 5) y(8y + 5)(8y - 5) ?