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
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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