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OpenStudy (anonymous):
solve....x^2=4x+21
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OpenStudy (anonymous):
x^2-4X-21=0 (x-7)(x+3)=0 x=7, x=-3
OpenStudy (unklerhaukus):
-21 can be the product of these factors ±1,±21, or ±3,±7 -4 is the sum of two of these factors , ie +3,-7
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