Answer
The value of\[f\left( -2 \right)\]is\[21\].
Work Step by Step
In the given above expression, replace\[x\]with\[-2\].
\[\begin{align}
& f\left( x \right)=3{{x}^{2}}-7x-5 \\
& =3{{\left( -2 \right)}^{2}}-7\left( -2 \right)-5 \\
& =12+14-5 \\
& =21
\end{align}\]
Therefore, the value of the function\[f\left( x \right)=3{{x}^{2}}-7x-5\], for \[x=-2\]is\[21\].
