Question

A=3x\(^4\) - 2x\(^3\) - x + 1

B= -\(2x^3+4x^2+5x\)

C= -\(3x^4+2x^2+5\)

Tính A-B-C

Answer 1

\(A-B-C\)

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

\(=3x^4-2x^3-x+1+2x^3-4x^2-5x+3x^4-2x^2-5\)

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