The symbol [x] means the greatest interger not greater than x.

If f(x)=[2x]-3x, find each value.

f(0)=2*0-3*0=0

f(0.5)= 2*0.5-3*0.5=1-1.5=-0.5

f(-3.5)=-7+10.5=3.5

f(x-1)=1-x

I just plugged in numbers instead of x. Is it correct or not?

Thank you very much.