Answer:
(x+7)(x-4) x=-7,4
Explanation:
The factors of -21 that add up to 4 are 7 and -3, so put those as your two second values in your binomials and solve for x, in this case being the negative versions of the second term in the binomial
(x + 7) (x - 3)
Find 2 numbers that add to 4 and multiply to -21
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