Question

5.
Factorise :
61 – 222-x+2
(iii) x3 + 13x2+32x+20
(ii) x2 – 3x2 - 9x - 5
2y + y2 - 2y - 1
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Answer 1

(!!!)ans x=-2 put the value in equation (-2 )3+13 (-2)2+32×-2+20

-8+13×4-64+20=

-72+52+20=0

x3+13x2+32x+20divide x+2

(x+2)(x2+11x+10)

(x+2)(x2+(10+1)x+10)

(x+2)(x2+10x+x+10)

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

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