How on earth do you solve this and what is the answer

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Plz will give brainliest

What is the solution set of the quadratic inequality x^2-5< or equal to 0