SOLUTION: Solve by using factorization a^2+4a-21=0

SOLUTION: Solve by using factorization a^2+4a-21=0

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Question 1200917: Solve by using factorization a^2+4a-21=0
Answer by ikleyn(52798) (Show Source): You can put this solution on YOUR website!
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H I N T

a^2 + 4a - 21 = (a+7)*(a-3).

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