simplify 3(y-y^2)+7y^2-3y

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3(y-y^2)+7y^2-3y: distribute the three in: 3y-3y^2 +7y^2 -3y. add/subtract like-figures: the 3y's cancel out because 3y-3y=0, so you are left with -3y^2+7y^2, giving you 4y^2.
by Level 2 User (2.0k points)

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