How do you multiply $(y - 7) (y + 7)$ $(y-7)(y+7)$ ?

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Answer 1 · 2018-04-19T07:26:40

$y^{2} - 7^{2}$ $y^2-7^2$

So here can apply a index rule which is:

$(a + b) (a - b) = a^{2} - b^{2}$ $(a+b)(a-b)=a^2-b^2$

So we just apply these brackets to get:

$(y - 7) (y + 7)$ $(y-7)(y+7)$

Simplify:

$y^{2} + 7 y - 7 y - 7^{2}$ $y^2+7y-7y-7^2$

Simplify:

$y^{2} - 7^{2}$ $y^2-7^2$

Hope this helps!

How do you multiply (y-7)(y+7)(y−7)(y+7)(y-7)(y+7)?