Can someone help me answer these questions?

Find the vertex and x and y-intercepts 1) f(x) = x2 - 4x 3) f(x) = 1 -x2 4) y = - 2x - 3 Find the vertex and x and y-intercepts 1) f(x) = x2 - 4x 3) f(x) = 1 -x2 4) y = - 2x - 3