a/+b/\(A\left(x\right)=2x^5+2-6x^2-3x^3+4x^5\)
\(=\left(2x^5+4x^5\right)-3x^3-6x^2+2\)
\(=6x^5-3x^3-6x^2+2\)
c/Bậc của \(A\left(x\right)\) là 5
d/\(A\left(1\right)=6\cdot1^5-3\cdot1^3-6\cdot1^2+2\)
\(=6-3-6+2\)
\(=-1\)
\(A\left(-2\right)=6\cdot\left(-2\right)^5-3\cdot\left(-2\right)^3-6\cdot\left(-2\right)^2+2\)
\(=6\cdot\left(-32\right)-3\cdot\left(-8\right)-6\cdot4+2\)
\(=-192-\left(-24\right)-24+2\)
\(=-190\)