a) 3(2-x)²+4(x-5)² = 3(4-4x+x²) + 4(x²-10x+25) = 12-12x+3x²+4x²-40x+100= -52x+7x²+112
b)(5x-2)(5x+2)-(3x+1) = 25x²-4-3x-1 = 24x²-3x-5
c) (3y-4)(5y+1)-(3y-4)²+2(5y+1)+(y-2)(y+2) = 15y²+3y-20y-4-9y²-24y+16y²+10y+2+y²-4 = 7y²-15y-6
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a) 3(2-x)²+4(x-5)² = 3(4-4x+x²) + 4(x²-10x+25) = 12-12x+3x²+4x²-40x+100= -52x+7x²+112
b)(5x-2)(5x+2)-(3x+1) = 25x²-4-3x-1 = 24x²-3x-5
c) (3y-4)(5y+1)-(3y-4)²+2(5y+1)+(y-2)(y+2) = 15y²+3y-20y-4-9y²-24y+16y²+10y+2+y²-4 = 7y²-15y-6