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OpenStudy (anonymous):
Hey, I've always had trouble working these problems: (5d - 6)(- 4d + 9) Simplify. (5d - 6)(- 4d + 9) Multiply. How do you work these out?
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OpenStudy (anonymous):
First, inner, outer, last. (5d*-4d)+(5d*9)+(-6*-4d)+(-6*9) =-20d^2+69d-45
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