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How do you expand $(y+4)^2$ ?

1 Answer

Sep 16, 2016

$y^2+8y+16$

Explanation:

$(y+4)^2 = (y+4)(y+4)$
$= y(y+4)+4(y+4)$
$=y^2+4y+4y+16$
$=y^2+8y=16$

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