A quadratic function f is given. f(x) = 7x2 + 14x (a) Express fin standard form. f ( x ) = (b) Find the vertex and x- and y-intercepts of f. (If an answer does not exist, enter DNE.) vertex ( x, y ) = x-intercepts (x, y) = (smaller x-value) ( x, y ) = (larger x-value) y-intercept (x, y) = (c) Sketch a graph of f