loqll: If f(x)=−27x3, what is the value of f(−9), to the nearest tenth (if necessary)?
Do you mean x
3 ?
I did this by typing x then I hit the 'sup' button that is located above the smilies. The curser is placed ther you need to enter 3. Then move the curser to the end and keep going.
Or
If you already have printed x3 you can just highlight the 3 and then hit the 'sup' button. The first way is marginally simpler I think but both work fine.
If you were somewhere else on the net where this was not available, the ^ means to the power of
so x
3 = x^3
It is good to know these things.
f(x) = -27x
3 f(-9) = -27*(-9)
3 =-27 * -729
=19683
+118723 
