If f(x)= 5x^2-4/x, findf(4)
5(4)^2-4/4
5(16)-4/4
80-4/4
76/4
19(answer)
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.
To find f(4) for the function f(x) = (5x^2 - 4) / x, you need to substitute 4 in place of x.
So, f(4) = (5(4)^2 - 4) / 4.
First, simplify the expression within the parentheses: 5(4)^2 = 5(16) = 80.
Now substitute that value into the expression: (80 - 4) / 4.
Next, perform the subtraction: 80 - 4 = 76.
Finally, perform the division: 76 / 4 = 19.
Therefore, f(4) = 19.