Question

Answer 1

\(A=4x^2-12x+9-x^2+6x-9+64x^3+1\\ A=64x^3+3x^2-6x+1\\ A=64\left(-8\right)+3\cdot4+12+1=-512+12+12+1=-487\\ B=27x^3-27x^2y+9xy^2-y^3-x^3-8y^3+9+6x+x^2\\ B=26x^3-9y^3-27x^2y+9xy^2+x^2+6x+9\\ B=26-72-54+36+1+6+9=-48\\ C=x^2-10xy+25y^2+8x^3-36x^2y+54xy^2-27y^3-x^3+3x^2y-3xy^2+y^3-8x^3-27y^3\\ C=-x^3-53y^3+x^2+25y^2-10xy-33x^2y+51xy^2\\ C=-\dfrac{1}{8}+\dfrac{53}{8}+\dfrac{1}{4}-\dfrac{25}{4}+\dfrac{10}{4}+\dfrac{33}{8}+\dfrac{51}{8}\\ C=-\dfrac{7}{2}+17=\dfrac{27}{2}\)