I'm having trouble evaluating thhis integral

S = integral sign

S 4 ( 5^4x+9) dx

I tried using X^n = (X^n+1 / n+1) + C by taking the constant 4 outside and to the left but the result after applying the above rule made no sense.

I then tried using substitution where 4x+9 = alpha. So the derivative of alpha is just 4 but cannot reconstruct what this will give. Here's what I ended up with:

alpha = @= 4x+9

derivative @ = d@ = 4

d@ / 4 = dx

thus,

S 4 (5^4x+9) dx= (5^4x+9) d@/4 but now I don't know what to do.