How do you combine like terms in $(y ^ { 2} - 15y + 20) + ( - y ^ { 2} + 8y - 16)$ ?

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Answer 1 · 2018-03-12T13:11:20

$-7y+4$

Combine same variable first:
$y^2+(-y^2)-15y+(+8y)+20+(-16)$
And make it:
$y^2-y^2-15y+8y+20-16 = -7y+4$

How do you combine like terms in (y ^ { 2} - 15y + 20) + ( - y ^ { 2} + 8y - 16)(y ^ { 2} - 15y + 20) + ( - y ^ { 2} + 8y - 16)?