Calculatrice du théorème des restes

Your input: find $f\left(3\right)$ for $f\left(x\right)=x^{3} - x^{2} + 2 x + 7$.

According to the remainder theorem, $f(a)$ is the remainder from dividing $f(x)$ by $x-a$.

Thus, to find $f\left(3\right)$, find the remainder from dividing $x^{3} - x^{2} + 2 x + 7$ by $x - 3$.

For this, use the synthetic division calculator.

The remainder is $31$, therefore, $f\left(3\right)=31$.

Answer: $f\left(3\right)=31$.