factorise 12y²+ 84 y+ 120
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Answer:
12y²+84y+120=0
12(y²+7y+10) =0
y²+7y+10=0
y²+5y+2y+10=0
y(y+5) +2(y+5) =0
(y+2) (y+5) =0
y+2=0
y=-2
y+5=0
y=-5
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