Mutliply by yet another 2, and then we have .
Now divide by 2, and we return to .
Increasing the exponent by one means to multiply once more; decreasing an exponent by one means to divide once more. On this applet, move the slider to the right to multiply, move it to the left to divide, and notice the exponent as you do so:
Use this applet to become familiar (again?) with some common exponent values:
Laws of Exponents
Review the laws of integer exponents on these page:
Summary of Exponent Laws
Next: Factoring Expressions