(a+b)(a squared-ab+b squared)
x(x2 + 36)
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) and (x + 4) are both factors
2x(x^2+x-6)
If that's 3x2 + 7x + 2, the answer is (x + 2)(3x + 1)
a(a^2 + 1)
(a+b)(a squared-ab+b squared)
(2a + c)(4a2 - 2ac + c2)
(x + y)(x + y)(x + y)
4y - 3
x + 4
w3+125
(y + 27)(y^2 - 27y + 729)
X2 + 2X - 35(X - 5)(X + 7)================take your pick of these two binomials
x(x2 + 36)
x(x^2 + 1)