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b)-a+(2a-3b-1)= -a + 2a - 3b - 1 = a - 3b - 1
c)-x2+(x2 -x-7)= -2x + 2x - x - 7 = -x - 7
c)-b3-(b3-b2-b)= -3b - 3b + 2b + b = -3b
b)-a+(2a-3b-1)=-a+2a-3b-1=a-3b-1
c)-x2+(x2 -x-7)=-x²+x²-x-7=-x-7
c)-b3-(b3-b2-b)=-b³-b³+b²+b=-2b³+b²+b
b)-a+(2a-3b-1)= -a +2a -3b - 1=-a - 3b -1
c)-x2+(x2 -x-7)= -x2 +x2 -x -7= -x - 7
c)-b3-(b3-b2-b)= -b3 -b3 +b2 +b= b2 +2