Question

How do you simplify `5^-3`?

Answer 1

Use the exponent rule: `x^color(red)(a) = 1/x^color(red)(-a)`

`5^color(red)(-3) = 1/5^color(red)(- -3) = 1/5^color(red)(3) = 1/(5 xx 5 xx 5) = 1/125 = 0.008`