Question

If $m = 2$, find the value of $3{m^2} - 2m - 7$.

Answer 1

Hint: Substitute the value of m in the given equation.
Given that, for $m = 2$, we have to find a value of $3{m^2} - 2m - 7$.
Putting value of $m$, we get
$
   \Rightarrow 3{m^2} - 2m - 7 \\
   \Rightarrow 3{\left( 2 \right)^2} - 2\left( 2 \right) - 7 \\
   \Rightarrow 12 - 4 - 7 \\
   \Rightarrow 1 \\
$

Note: When there is only one variable in the problem and of which value is also given, one should simply put the value and do the necessary calculations in order to get the answer.