Final answer:
To find the value of (f(g(3))), substitute the value of g(3) into f(x).
Step-by-step explanation:
To find the value of (f(g(3))), we first need to find the value of g(3) and then substitute that value into f(x).
Given that g(x) = 6x, we can substitute 3 into g(x) to find g(3). g(3) = 6 * 3 = 18.
Now, we substitute the value of g(3) into f(x). f(g(3)) = f(18) = -4*18 + 7 = -72 + 7 = -65.