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Factor: n^2+4n-21
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quadratic is (-4 +-sqrt(100))/2
you need two numbers whose product is -21 and sum = + 4 then insert them into the blank spaces: (n )(n )
(n+7)(n-3) gives n=-7 and n=+3
that would be correct
MCronin, your way involves less trial and error ;) I can appreciate that!
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the question asked to factor the function so answer is (x+7)(x-3)
True, but the quadratic formula is useful in finding those factors as well. One method is not more "right" than the other.
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