EXPLANATION:
The steps to follow to evaluate an expression are the following:
-We must first replace the values in the corresponding assigned variable.
-Then we must begin to perform the operations of higher degree in this case, first solve the fraction, as well as double the 4.
The exercise is as follows:
[tex]\begin{gathered} 8x^2+\frac{51}{y} \\ 8(4)^2+\frac{51}{3} \\ 8(16)+17 \\ 128+17 \\ 145 \\ \text{the answer is 145} \end{gathered}[/tex]