Question

5.
Factorise :
(i) r-2 rº - x + 2
(iii) x + 13x2+ 32x + 20
(ii) x - 3x2 - 97 - 5
(iv) 2y + y? - 2 -​1

Answer 1

Answer:

Correct option is

D

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

The value of x3+13x2+32x+20 is

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

=x2(x+1)+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)