1. -12(x²-1) = -12x²+12
2. (4x-3y)* 7-10x(2-y) = 28x-21y-20x+10xy = 48x-21y+10xy
3. b(b+a)-a(2a+b) = b²+ab-2a²-ab = b²-2a²+2ab
4. (x²-5x-8)+(2x²+6x+7) = x²-5x-8+2x²+6x+7 = -x²-x-1
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1. -12(x²-1) = -12x²+12
2. (4x-3y)* 7-10x(2-y) = 28x-21y-20x+10xy = 48x-21y+10xy
3. b(b+a)-a(2a+b) = b²+ab-2a²-ab = b²-2a²+2ab
4. (x²-5x-8)+(2x²+6x+7) = x²-5x-8+2x²+6x+7 = -x²-x-1