(3x+2)²-16
(3x+2)(3x+2)-16
9x²+6x+6x+4-16
9x²+12x+4-16 = 9x²+12x-12
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(3x+2)²-16
(3x+2)(3x+2)-16
9x²+6x+6x+4-16
9x²+12x+4-16 = 9x²+12x-12