Factorise completely the expression
(x+2)2...
Factorise completely the expression
(x+2)2 - (2x+1)2
(3x + 2)(1 - x)
(3x + 2)(2x + 1)
3(x+2)2
3(x + 1)(1 - x)
Correct answer is D
(x+2)2 - (2x+1)2
= (x2+4x+4)−(4x2+4x+1)
= x2 + 4x + 4 - 4 x2 - 4x - 1
= -3 x2 + 3
= 3 - 3 x2
= 3(1 - x2)
= 3(1 + x)(1 - x)
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