Question

A(x)=x⁴ - 2x³+5x²+4 và B(x)= -2x³+2x⁴-x²-1 Tính A(x) và A(x) -B(x)

Answer 1

\(A\left(x\right)-B\left(x\right)=x^4-2x^4-2x^3+2x^3+5x^2+x^2+4+1\)

\(=-x^4+6x^2+5\)

Answer 2

\(A\left(x\right)-B\left(x\right)=x^4-2x^4-2x^3+2x^3+5x^2+x^2+1+4\)

\(A\left(x\right)-B\left(x\right)=6x^2-x^4+5\)

Answer 3

\(\text{A(x) - B(x) = }\left(x^4-2x^3+5x^2+4\right)-\left(-2x^3+2x^4-x^2-1\right)\)

\(A\left(x\right)-B\left(x\right)=x^4-2x^4-2x^3+2x^3+5x^2+x^2+4+1\)

\(A\left(x\right)-B\left(x\right)=-x^4+6x^2+5\)