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The exponent is an unknown variable. It is a variable because it will change into a known number when we get further into the equation.

Take this for example.

4x=8 - where x is the exponent.

To work out the problem we simply move the 4 over the equal's sign. Since it is 4x, this means that it is 4 times x. Since we are moving the 4 over the equals sign, we have to change the multiplication, into a division.

x=8/4 which equals 2. The x is a 2.

To check, we we substitute the 2 with the x in the equation. 4x2=8, which is correct.

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Q: What does the exponent mean in scientific notation?
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