`B(x) = 3x^2 - 2x^3 + x - x^2 - 5`
`B(x) = -2x^3 + ( 3x^2 - x^2 ) + x - 5`
`B(x) = -2x^3 + 2x^2 + x - 5`
\(B\left(x\right)=3x^2-2x^3+x-x^2-5\)
\(B\left(x\right)=\left(-2x^3\right)+\left(3x^2-x^2\right)+x+\left(-5\right)\)
\(B\left(x\right)=-2x^3+2x^2+x-5\)