(x + 10) and (x + 4) are both factors
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(x + 10)(x + 4)
(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)
10(x+4)
The greatest common factor of the numbers 40 and 40 is 9.