Find f (6) if f (x) = x^2 divided by 3x+x

So, if I'm understanding you correctly, f (x) = x^2 divided by 3x+x, or

f (x) = (x^2) / (3x+x)

f (6) - - > plug the 6 in to all values of x - - > f (6) = (6^2) / (3*6 + 6) = 36 / (18+6)

= 36/24 - - > both are divisible by 12, so 36/12=3 and 24/12=2, now we have the reduced (simplified) answer:

f (6) = 3/2, or 1 1/2, or 1.5