Let the derivative of a function f be given by

f(x) =x(6 7x)^3for allx.

(a)Find the interval wherefis increasing.

The interval is of the form(a,b). Enter the values ofaandb(in that order) into the answer box below, separated with a comma.

(b)Find thex-coordinate of the relative maximum.(c)Find thex-coordinate of the relative minimum.