(y + 3z)(y^2 - 3yz + 9z^2)
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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)
x2-12x+35 = (x-5)(x-7)