Consider f(x)=2x^2+8x-7, and reply the following questions:
A. Find out cordinates of the vertex of f(x).
B. Find out axis of symetry of f(x)
C. Determine coordinates of x and y intercepts of f(x)
D. Write doman and range of f(x) in interval notation.
E. Write intervals on which f(x) is increasing and decreasing.