Help solving please

The graph of a quadratic function fis given. f (x) - -x2 + 8x - 7 y (a) Find the coordinates of the vertex and the x- and y-intercepts. vertex ( x, y ) = x-intercepts (x, y) = (smaller x-value) ( x , y ) = (larger x-value) y-intercept ( x , V ) = ( (b) Find the maximum or minimum value of f. The ---Select-- ~ value of f is f(x) = (c) Find the domain and range of f. (Enter your answers using interval notation.) domain range