Question

cho 2 da thuc :f(x)=3x^3 - 2x^2 + x + 5

                        g(x)=3x^2 + ax + b

 tim a,b sao cho f(x)=(x-1)*g(x)

moi nguoi giai giup em voi

Answer 1

\(f\left(x\right)=\left(x-1\right).g\left(x\right)\)

\(\Rightarrow3x^3-2x^2+x+5=\left(x-1\right)\left(3x^2+ax+b\right)\)

\(\Rightarrow3x^3-2x^2+x+5=3x^3+ax^2+bx-3x^2-ax-b\)

\(\Rightarrow-2x^2+x+5=x^2\left(a-3\right)+x\left(b-a\right)-b\)

-Bạn kiểm tra lại đề.