Evaluate a Piecewise Function

Consider the piecewise function defined as follows:

$$f(x) = \begin{cases} 2x + 3 & \text{if } x < 0 \\ x^2 - 1 & \text{if } x \geq 0 \end{cases}$$

If you want to find the value of $$f(-2) + f(3)$$, what is the resulting value?