Answer:
[tex]12a - 3 {b}^{2} = 12(9) - 3 {(4)}^{2} \\ = 108 - 48 \\ = 60[/tex]
60
Step-by-step explanation:
Just substitute the value
[tex]12\cdot (9) - 3 \cdot(4)^2 = \\108 - 48 =60[/tex]
