Câu hỏi của Huệ Nguyễn

a) Ta có: \(M\left(x\right)=5x^3+2x^4-x^2+3x^2-x^3-x^4+1-4x^3\)\(=x^4+2x^2+1\)b) \(M\left(1\right)=1^4+2\cdot1^2+1=1+2+1=4\)\(M\left(-1\right)=\left(-1\right)^4+2\cdot\left(-1\right)^2+1=1+2+1=4\)Câu trả lời: a) Ta có: \(M\left(x\right)=5x^3+2x^4-x^2+3x^2-x^3-x^4+1-4x^3\)\(=x^4+2x^2+1\)b) \(M\left(1\right)=1^4+2\cdot1^2+1=1+2+1=4\)\(M\left(-1\right)=\left(-1\right)^4+2\cdot\left(-1\right)^2+1=1+2+1=4\)