3(2x+1)² + (2x+1)-4
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3(2x+1)² +. (2x+1) -4
=3(4x²+1+4x)+(2x+1)-4
=12x²+3+12x-8x-4
=12x²+4x-1
=12x²+6x-2x-1
=6x(2x+1)-(2x+1)
=(6x-1) (2x+1)
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