Identify a, b, c: Identify a, b, and c in the quadratic expression 7y2+9y+2. Compare 7y2+9y+2 with the standard form ay2+by+c. a=7b0b1
Find numbers for multiplication: Find two numbers that multiply to a∗c (which is 7∗2=14) and add up to b (which is 9).We need to find two numbers that satisfy these conditions.After checking possible pairs that multiply to 14 (such as 1 and 14, 2 and 7), we find that the pair 1 and 14 does not add up to 9, but the pair 2 and 7 does.So, the two numbers are 2 and 7.
Rewrite middle term: Rewrite the middle term 9y using the two numbers found in Step 2.We can express 9y as 7y+2y.So, the expression 7y2+9y+2 can be rewritten as 7y2+7y+2y+2.
Factor by grouping: Factor by grouping.We group the terms as follows: 7y2+7y + 2y+2.Now, factor out the greatest common factor from each group.From the first group, we can factor out 7y, giving us 7y(y+1).From the second group, we can factor out 2, giving us 2(y+1).
Write factored form: Write the factored form of the expression.Since both groups contain the factor (y+1), we can factor this out.The factored form is (7y+2)(y+1).
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