a.
\(\left(3x^2-2x+5\right)-\left(5x^2-4x+1\right)-2x+2x^2-1\)
\(=3x^2-2x+5-5x^2+4x-1-2x+2x^2-1\)
\(=3\)
b.
\(4x^3-5x^2+6-\left(4x^3-x+2x^2\right)+\left(7x^2-x+8\right)\)
\(=4x^3-5x^2+6-4x^3+x-2x^2+7x^2-x+8\)
\(=14\)
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