To find $(g \circ f)(0)$, also known as $g(f(0))$, we will first find $f(0)$ and then substitute the result into $g(x)$.

Step 1: Find $f(0)$

Given $f(x) = 2x + 5$, substitute $x = 0$ into the equation: $f(0) = 2(0) + 5 = 5$

Step 2: Find $g(f(0)) = g(5)$

Now, substitute $f(0) = 5$ into $g(x)$, which is given as $g(x) = x^2$: $g(5) = 5^2 = 25$

Final Answer:

$(g \circ f)(0) = 25$

Would you like further details or clarification on this?

Here are 5 related questions:

1. What is $(f \circ g)(0)$?
2. How would you find $(g \circ f)(x)$ for any $x$?
3. Can you explain the difference between function composition and multiplication?
4. What is $(g \circ f)(2)$?
5. How do you find the inverse of a function?

Tip: Always double-check the order of composition when working with multiple functions—it's crucial for getting the right result!