Question

Thu gọn đa thức: \(P = 2{x^3} - 5{x^2} + 4{x^3} + 4x + 9 + x\)

Answer 1

\(\begin{array}{l}P = 2{x^3} - 5{x^2} + 4{x^3} + 4x + 9 + x\\ = \left( {2{x^3} + 4{x^3}} \right) - 5{x^2} + \left( {4x + x} \right) + 9\\ = 6{x^3} - 5{x^2} + 5x + 9\end{array}\)\(\)

Answer 2

\(P=2x^3-5x^2+4x^3+4x+9+x\\ =\left(2x^3+4x^3\right)-5x^2+4x+x+9\\ =6x^3-5x^2+5x+9\)