factor the trinomial y (to the second) -10y+21

asked Sep 20, 2015 155k views

5 votes

factor the trinomial

y (to the second) -10y+21

by Oers

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3 votes

$y^2-10y+21 \to y^2-3y-7y+21= \\\\ = y(y-3)-7(y-3)= \\\\ =\boxed{(y-3)(y-7)}$

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