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Q: Which of the binomials is a factor of this trinomial x2 plus 6x - 40?

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x - 4 APEX

(x + 10)(x + 4)

You didn't bother to list the binomials to choose from, but the two binomial factors of x2 + 6x - 40 are (x + 10) and (x - 4)

(x + 10)(x + 4)

That will depend on the plus or minus value of 40 which has not been given. If it's +40 then when factored it is (x-5)(x-8)

If that's 6x - 40, and one of the choices is either (x + 10) or (x - 4), pick that one.

x2+14x+40 = (x+4)(x+10) when factored

(x + 10)(x + 4)

(x - 5)(x - 8)

(x + 8)(x - 5)

(x + 5)(x + 8)

x2+14x+40 = (x+4)(x+10) when factored

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