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Evaluate the function $f(x)=2 x^{2}-5 x$ when $x=4$

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Final Answer: The value of the function $f(x)=2 x^{2}-5 x$ when $x=4$ is $\boxed{12}$.

Steps

Step 1 ：The question is asking to evaluate the function $f(x)=2 x^{2}-5 x$ when $x=4$.

Step 2 ：To solve this, we need to substitute $x=4$ into the function and simplify the expression.

Step 3 ：Substituting $x=4$ into the function, we get $f(4)=2(4)^{2}-5(4)$.

Step 4 ：Simplifying the expression, we get $f(4)=12$.

Step 5 ：Final Answer: The value of the function $f(x)=2 x^{2}-5 x$ when $x=4$ is $\boxed{12}$.