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OpenStudy (anonymous):
Use Synthetic Division to divide x2 + 10x + 21 by x + 3 x + 7 x - 7 7x + 21 7x - 21
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OpenStudy (anonymous):
why? just check which one works!
OpenStudy (anonymous):
bottom two are out for sure and \[(x+3)(x-7)=x^2-4x-21\] so it is the first one
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