x = 12, y = 8, and z = 3
Substitute their values in the expression above
[tex]\frac{(12)(8)^2-3(3)}{3}[/tex]At first find 8^2
8^2 = 64
Multiply 3 by 3
3 * 3 = 9
[tex]\frac{12(64)-9}{3}[/tex]Now multiply 12 by 64
12 * 64 = 768
[tex]\frac{768-9}{3}=\frac{759}{3}[/tex]Simplify the fraction by dividing up and down
[tex]\frac{759}{3}=253[/tex]The value of the expression is 253
