Question 46: Simplify the expression \(A=x \cdot(2 x+1)-x^{2} \cdot(x+2)+\left(x^{3}-x+5\right) \ ) we get:
\(\begin{aligned} &A=x \cdot(2 x+1)-x^{2} \cdot(x+2)+\left(x^{3}-x+5\right) \\ &A =2 x^{2}+xx^{3}-2 x^{2}+x^{3}-x+5 \\ &A=6 . \end{aligned}\)
===============