SOLUTION: If one of the factors of the quadratic expression x^2 + x - 56 is (x+7), then what is the value of k?

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Question 915359: If one of the factors of the quadratic expression x^2 + x - 56 is (x+7), then what is the value of k?
Found 2 solutions by Fombitz, josgarithmetic:
Answer by Fombitz(32388) About Me  (Show Source):
Answer by josgarithmetic(39617) About Me  (Show Source):
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k is not found in the expression or its given binomial factor. You might be able to find the other binomial factor either through factorization, or through polynomial division. I mentally see a "8" and a "7".

%28x%5E2%2Bx-56%29%2F%28x%2B7%29=%28%28x-7%29%28x%2B8%29%29%2F%28x%2B7%29

x%2B7 is not a factor of x%5E2%2Bx-56.