Identify coefficients: Identify the coefficients a, b, and c in the quadratic expression 3y2+7y+4 by comparing it to the standard form ax2+bx+c.a=3b=7c=4
Find two numbers: Find two numbers that multiply to a∗c (which is 3∗4=12) and add up to b (which is 7).The two numbers that satisfy these conditions are 3 and 4 because:3×4=123+4=7
Rewrite middle term: Rewrite the middle term 7y using the two numbers found in the previous step.3y2+7y+4 can be rewritten as 3y2+3y+4y+4.
Group and factor: Group the terms into two pairs and factor by grouping.Group (3y2+3y) and (4y+4).Factor out the greatest common factor from each group.From (3y2+3y), factor out 3y: 3y(y+1).From (4y+4), factor out 4: 4(y+1).
Notice common factor: Notice that both groups now contain the common factor (y+1).Write the expression as the product of (y+1) and the other factors.The factored form is (3y+4)(y+1).
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