I'm not sure how to do factorize this problem: X^2 + 4X - 21 The answer is: (X-3)(X+7) So I tried to split it up like this: X(X+1)-3(X+7) .. but I'm not sure how to group it. Help please?
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You should find its roots. Do you know the quadratic formula? If not you can still figure the factor out: first second: must be so you try with integers and get it soon.
Last edited by james_bond; January 29th 2009 at 09:11 AM.
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