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$4w^2+5w-81$

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Factor quadratics

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Q.

4w^2+5w-81

Find Numbers: First, we need to find two numbers that multiply to $4\times(-81)=-324$ and add up to $5$ .
Verify Numbers: Looking for two such numbers, we find that $36$ and $-9$ work because $36 \times (-9) = -324$ and $36 + (-9) = 27$ , oops, that's not right, it should be $5$ .

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