factorise x^3 + 13x^2 + 32x + 20.
with steps. please.
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1
Answer:
(x+1) (x+2) (x+10)
Step-by-step explanation:
f(x) = x^3 + 13x^2 + 32x + 20
f(-) = -1 + 13 - 32 + 20
f(-1) = 0
hence...
f(x) = (x+1) g(x)
g(x) = f(x) / (x+1)
g(x) = x^2 + 12x + 20
g(x) = (x+10) (x+2)
therefore....
f(x) = (x+1) (x+2) (x+10)
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