Find f(4) if f(x) =

Question

Find f(4) if f(x) = x²+9/x+1

Answer 1

Hello, Rylea,

Since f(x) = x²+9/x+1

Then f(4) means use "4" when there is an "x."

f(4) = 4² + 9/4 + 1

f(4) = 16 + 2 1/4 + 1

f(4) = 19 1/4

Does this help?

Bob

Answer 2

Simply replace all the x's with 4's in your formula:

f(x) = x² + 9/x + 1

f(4) = (4)² + 9/(4) + 1

simplify the right hand side and you are done.