[tex]9r^2+(n^2-1)t[/tex]
To evaluate the above expression, let's substitute the variables with their corresponding equivalent.
r = -1, n = 3, and t = 12
[tex]9(-1)^2+(3^2-1)(12_{})[/tex]
The first thing to do is to simplify/solve the numbers with the exponents.
[tex]9(1)+(9-1)(12)[/tex]
Next, eliminate the parenthesis by applying the operation connected to it.
[tex]\begin{gathered} 9+8(12) \\ 9+96 \\ 105 \end{gathered}[/tex]
Therefore, the answer to the above expression given the values of the variables is 105.
