Rút gọn biểu thức a) ((x + 2)^2) -(x + 3)(x - 3) + 10 b) (x + 1) ((x^2)- x + 1) - (x(x^2) - 1)

a) \(\begin{array}{l}{\left( {x + 2} \right)^2} - \left( {x + 3} \right)\left( {x - 3} \right) + 10\\{\rm{   }} = {x^2} + 4x + 4 - {x^2} + 9 + 10\\{\rm{     =  }}4x + 23\end{array}\)

b) \(\left( {x + 1} \right)\left( {{x^2} - x + 1} \right) - x\left( {{x^2} - 1} \right)\)

\( = {x^3} + 1 + x - {x^3}\)

\( = 1 + x\)