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CBSE Class 9 Answered

Factorize:(a) 4a2 -9b2 -2a -3b (b) a2 + b2 -2(ab -ac + bc)
Asked by Topperlearning User | 14 Feb, 2014, 03:54: PM
answered-by-expert Expert Answer

(a)

4a2-9b2-2a-3b

=[(2a)2-(3b)2]-(2a+3b)

=(2a-3b) (2a+3b)-(2a+3b)

=(2a+3b) [2a-3b-1]

=(2a+3b) (2a-3b-1)

(b)

a2+b2-2(ab-ac+bc)

=a2+b2-2ab+2ac-2bc

=(a-b)2+2c(a-b)

=(a-b)(a-b)+2c(a-b)

=(a-b)(a-b+2c)

Answered by | 14 Feb, 2014, 05:54: PM
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