(12y2+17y-4)+9y2-13y+3)

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Arnabkaycee · Answer 1 · 2017-06-30T19:46:32+0000

add together the same variables. 12y^2 = 9y^2 becomes 21y^2. 17y - 13y is 4y. and -4 +3 is -1. so the answer is 21y^2 +4y -1