Question

Factorise; x3+13x2+3xz+20​

Answer 1

Answer:

Answer. Therefore (x + 1) is a factor of p(x). Hence, x3 + 13x2 + 32x + 20 = (x + 1) (x +2) (x + 10) .

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Answer 2

The value of x

3

+13x

2

+32x+20 is

x

3

+x

2

+12x

2

+12x+20x+20

=x

2

(x+1)+12x(x+1)+20(x+1)

=(x−1)(x

2

+12x+20)

=(x−1)(x

2

+10x+2x+20)

=(x+1)[x(x+10)+2(x+10)]

=(x+1)(x+2)(x+10)