a: \(=8x^3-12x^2+6x-1-x^3-6x^2-12x-8-25x^2+1\)
\(=7x^3-38x^2-6x-8\)
b: \(=9x^2-12x+4-8x^3-12x^2-6x-1-x^3+9x^2-27x+27\)
\(=-9x^3+6x^2-45x+30\)
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\(c,=16x^2-9-\left(8x^3-36x^2+54x-27\right)-\left(x^3+12x^2+48x+64\right)\\ =16x^2-9-8x^3+36x^2-54x+27-x^3-12x^2-48x-64\\=-9x^3+40x^2-102x-46\\ d,=8-36x+54x^2-27x^3-\left(x^3+6x^2+12x+8\right)-3\left(4x^2-1\right)\\ =8-36x+54x^2-27x^3-x^3-6x^2-12x-8-12x^2+3\\ =-28x^3+36x^2-48x+3\)
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