Answers

2016-03-25T16:24:24+05:30
(2a + b)² - 6a - 3b - 4
(2a + b)² - 3(2a + b) - 4
y² - 3y - 4  [ put y = 2a + b ]
y² - 4y + y - 4 
y(y-4) + 1(y-4)
(y+1)(y-4)
(2a + b + 1)(2a + b - 4)
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2016-03-25T16:31:06+05:30
(2a+b)²-6a -3b-4
=(2a+b)²-3(2a+b)-4 =0
=(2a+b)²- 4(2a+b) +(2a+b) -4 =0
=(2a+b)(2a+b-4)+1(2a+b-4)=0
=(2a+b-4)(2a+b+1) =0
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