21. Factorise: x3 + 13x2 + 32x + 20 – InterviewSolution

1.

21. Factorise: x3 + 13x2 + 32x + 20

Answer»

Step-by-step explanation:

X3 + 13x2 + 32x + 20

x3 + x2 + 12x2 + 12x + 20X +20

x2(x+) + 12x(x+1) + 20(x+1)

(x+1) = (x2 + 12x + 20)

(x+1) = (x2 + 10X + 2X + 20)

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

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

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