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ICSE Class 8 Answered

Iam unable to factorise the following
 
1    2a +6b- 3(a+3b)^2
 
2.   16(2p-3q)^2 -4(2p-3q)
 
3.   (x+y)(2x+5) - (x+y)(x+3)
Asked by tejvarun | 08 Jun, 2015, 07:23: PM
answered-by-expert Expert Answer
begin mathsize 18px style 1. space space 2 a plus 6 b minus 3 left parenthesis a plus 3 b right parenthesis squared equals 2 left parenthesis a plus 3 b right parenthesis minus 3 left parenthesis a plus 3 b right parenthesis squared equals left parenthesis a plus 3 b right parenthesis left square bracket 2 minus 3 left parenthesis a plus 3 b right parenthesis right square bracket equals left parenthesis a plus 3 b right parenthesis left square bracket 2 minus 3 a minus 9 b right square bracket 2. space space 16 left parenthesis 2 p minus 3 q right parenthesis squared minus 4 left parenthesis 2 p minus 3 q right parenthesis equals 4 left parenthesis 2 p minus 3 q right parenthesis left square bracket 4 left parenthesis 2 p minus 3 q right parenthesis minus 1 right square bracket equals 4 left parenthesis 2 p minus 3 q right parenthesis left square bracket 8 p minus 12 q minus 1 right square bracket S i m i l a r l y comma space y o u space c a n space s o l v e space t h e space 3 r d space o n e space b y space t a k i n g space left parenthesis x plus y right parenthesis space c o m m o n. end style
Answered by Rashmi Khot | 09 Jun, 2015, 08:43: AM

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