a) 2(6x - 7) -(4x - 2)(x + 5)= 12x-14 - ( 4x² +20x -2x -10) = 12x-14-(4x²+18x-10) = 12x-14-4x²-18x+10= -6x-4-4x²= -4x²-6x-4
b) (x-4)²(2x + 7)=(x²-8x+16)•( 2x+7) =3x³+7x² -16x²-56x+32x+112= 2x³-9x²-24x+112
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a) 2(6x - 7) -(4x - 2)(x + 5)= 12x-14 - ( 4x² +20x -2x -10) = 12x-14-(4x²+18x-10) = 12x-14-4x²-18x+10= -6x-4-4x²= -4x²-6x-4
b) (x-4)²(2x + 7)=(x²-8x+16)•( 2x+7) =3x³+7x² -16x²-56x+32x+112= 2x³-9x²-24x+112
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