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Mathematics
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21 March, 19:25
Factoring
x^2-4x-21=0
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Meredith Blackwell
21 March, 21:57
0
Find two numbers that add to - 4 and that multiply to - 21.
After playing around with some numbers, I got - 7 and 3.
So, the factored form is (x - 7) (x + 3).
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