SAT Question befeb95f: Nonlinear Functions answer and explanation with Desmos solution

The value of $f\left(2\right)$ is the value of $f\left(x\right)$ when $x=2$. The function $f$ is defined by $f\left(x\right)=x^3+15$. Substituting $2$ for $x$ in this equation yields $f\left(2\right)=2^3+15$. This equation can be rewritten as $f\left(2\right)=8+15$, or $f\left(2\right)=23$. Therefore, the value of $f\left(2\right)$ is $23$.