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That doesn't factor neatly. Applying the quadratic formula, we find two real solutions: (-5 plus or minus 2 times the square root of 10) divided by 5.
x = 0.2649110640673518
x = -2.2649110640673518
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)
x2 - 10x - 39
= x2 + 3x - 13x - 39
= x(x + 3) - 13(x + 3)
= (x - 13)(x + 3)
If that's 6x - 40, and one of the choices is either (x + 10) or (x - 4), pick that one.
I'm guessing you meant to write x2 - 13x + 40 and you meant to include a list of binomials to choose from. Since that factors to (x - 5)(x - 8), make sure that one of those is on the list.
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