Simplify the following expression completely: \( -(5 z)^{2} \). Enter your answer below without using any parentheses. You do not need them! \( \begin{array}{l}\text { Basic Vars Funcs Trig }\end{array} \)

To simplify the expression \( -(5 z)^{2} \), start by squaring the term inside the parentheses: \((5 z)^{2} = 25 z^{2}\). Now, applying the negative sign in front, you get: \(- (5 z)^{2} = -25 z^{2}\). So the final simplified expression is \( -25 z^{2} \).