(12(2x+1)^3)+(8(2x+1)^2)-(20(2x+1))

=12*(2x+1)(4x^2+4x+1) + 8(4x^2+4x+1) - (40x+20)

= 12*(8x^3+8x^2+2x+4x^2+4x+1)+32x^2+32x+8-40x-20

= 96x^3+96x^2+24x+48x^2+48x+12+32x^2+32x-40x-12

= 96x^3+176x^2+64x

let me how it goes...

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