a)
[tex]2^3+3^2+4^2=8+9+16=8+25=\boxed{33}\\[/tex]
b)
[tex]5^2\cdot4-7^2\cdot2=25\cdot4-49\cdot2=100-98=\boxed2\\[/tex]
c)
[tex]3\cdot(4+2)^2=3\cdot6^2=3\cdot36=\boxed{108}[/tex]
