8/90c)2x² (x-5)-3x(x² -3x+5) d)6(a² +b+1/3)-6(a² -1/2)-3(b+1/3)
9/90
c) 2x² (x-5)-3x(x² -3x+5)= 2x^3- 10x^2- 3x^3+9x^2-15x=-x^3-x^2-15x
d)6(a² +b+1/3)-6(a² -1/2)-3(b+1/3)= 6a^2+6b+2-6a^2+3-3b-1=3b+4
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c) 2x² (x-5)-3x(x² -3x+5)= 2x^3- 10x^2- 3x^3+9x^2-15x=-x^3-x^2-15x
d)6(a² +b+1/3)-6(a² -1/2)-3(b+1/3)= 6a^2+6b+2-6a^2+3-3b-1=3b+4
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