f(x)= (3/2)x - (1/2)
See first we need to understand what is f(x)..this is function of x
where if we change x values that will affect the function's value
means for different x's u will get diff f(x)
here u need to just put x=6 in function equation.
f(6)=(3/2)*6-1/2
f(6)=9-1/2
f(6)=17/2