factorise the (3x + 2)^2 - 4(2x + 1)^2
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Answer: -7x^2 - 4x
Step-by-step explanation:
( 3x +2 )^2 - 4(2x+1)^2
= 9x^2 + 12x +4 - 4(4x^2+4x+1)
=9x^2 + 12x +4 - 16x^2-16x-4
= - 7x^2-4x
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