Perform the operations
(12y^2+17y-4)+ 9y^2-13y+3
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[i] (12y² + 17y - 4) + 9y² - 13y + 3
= 12y² + 9y² + 17y - 13y - 4 + 3
= 21y² + 4y - 1
If we factorise it, we get,
= 21y² + (7 - 3)y - 1
= 21y² + 7y - 3y - 1
= 7y(3y + 1) - 1(3y + 1)
= (3y + 1)(7y - 1)
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