Finding the Value of a Quadratic Function

Samantha is solving a quadratic equation given by the function $f(x) = ax^2 + bx + c$. She knows that one root of the equation is $x = 2$, and the other root is $x = -3$. The function can also be expressed in factored form as $f(x) = a(x - 2)(x + 3)$. If the value of $a$ is 4, what is the value of $f(1)$?