f(x)=11x-15
g(x)=!5x^2+12x-13
find f(g(4))
g(x) = 15x2 + 12x - 13
g(4) = 15·42 + 12·4 - 13 = 275
f(x) = 11x - 15
f( g(4) ) = f( 275 ) = 11·275 - 15 = ....