math
posted by Adrian on .
Factor completely
x³8x²+11x+20

try some factors of 20
I tried ±1 and sure enough 1 worked, so x+1 is a factor
Then by either long division or synthetic division of x³8x²+11x+20 by x+1
we would get x^2  9x + 20
which factors again into (x4)(x5)
so x³8x²+11x+20 = (x+1)x4)(x5)