a) 3(a²-4) - (2-a²)=3a²-12-2+a²=3a²+a²-12-2=4a²-14
b) -(3x + 4) + 2(5x-3)=-3x-4+10x-6=-3x+10x-4-6=7x-10
c) 3(5-x)-4(2x - 3)=-3x+15-8x+12=-3x-8x+15+12=-11x+27
d) -5(2x+3) - 3(5 - 3x)=-10x-15+9x-15=-10x+9x-15-15=-x-30
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a) 3(a²-4) - (2-a²)=3a²-12-2+a²=3a²+a²-12-2=4a²-14
b) -(3x + 4) + 2(5x-3)=-3x-4+10x-6=-3x+10x-4-6=7x-10
c) 3(5-x)-4(2x - 3)=-3x+15-8x+12=-3x-8x+15+12=-11x+27
d) -5(2x+3) - 3(5 - 3x)=-10x-15+9x-15=-10x+9x-15-15=-x-30