Evaluate $f(-1)$ when $f(x)=(x+7)(x-5)$ When $f(x)=(x+7)(x-5), f(-1)=$

Step 1 ：Given the function \(f(x)=(x+7)(x-5)\), we are asked to evaluate \(f(-1)\).

Step 2 ：To find the value of \(f(-1)\), we substitute \(x\) with \(-1\) in the function.

Step 3 ：So, \(f(-1)=(-1+7)*(-1-5)\)

Step 4 ：Solving this, we get \(f(-1) = -36\)

Step 5 ：Final Answer: \(\boxed{-36}\)