Question

For two functions, f(x) and g(x), a statement is made that f(x) = g(x) at x = 5. What is definitely true about x = 5?

Answer 1

The last statement is the valid one: both f(x) and g(x) have the same output value at x = 5.

f(x) at x = 5 is f(5), this is the output of the function f when x =5
g(x) at x = 5 is g(5), this is the output of the function g when x =5

Then the two output have the same value at x =5.