Find the exact value of tan 195 degrees

The $x$-intercepts of the parabola $y = x^2 + bx + c$ are $(-3,0)$ and $(5,0).$ find the equation of the parabola, and submit your answer in $y = ax^2 + bx + c$ form.

Multiplying an even number of negative numbers gives an answer that is choose from:

For which pair of functions is (gof)(a)=|a|-2?