Question 4 of 29 (0.5 points) 1 Attempt 1 of Unlimited Evaluate $f(0)$ when $f(x)=(x-5)(x+5)$ When $f(x)=(x-5)(x+5), f(0)=$

Step 1 ：Given the function $f(x)=(x-5)(x+5)$, we are asked to evaluate $f(0)$.

Step 2 ：To find the value of $f(0)$, we substitute $x=0$ into the function $f(x)=(x-5)(x+5)$.

Step 3 ：Substituting $x=0$ into the function gives $f(0)=(0-5)(0+5)$, which simplifies to $f(0)=-25$.

Step 4 ：Final Answer: \(\boxed{-25}\)