If f(x)= 5x^2-4/x, findf(4)

Question

5(4)^2-4/4
5(16)-4/4
80-4/4
76/4
19(answer)

Answer 1

If you mean f(x) = (5x^2 -4)/x, and not 5x^2 - (4/x), then you are correct. Proper use of parentheses in ambiguous equations is very important.