Finding the coefficients of a quadratic equation giving one point and open interval

Question

Here is my question

The quadratic function $f$ is negative only on the open interval $(−2, 1/4 )$ and its graph passes through the point$ (−1, −5)$. Determine the coefficients of f and sketch its graph.

Please explain how you got your answer and thank you.

Answer 1

$f(x)=\kappa(x+2)(x-\frac{1}{4})$ then $f(-1)=-5$ to deduce $\kappa$