added guide for exponents (#24631)

I added formulas for the basic rules of exponents and information about 0^0=? (whether it is 1 or 0).

guide/english/mathematics/exponents-basic-rules/index.md

@@ -8,8 +8,24 @@ This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/
 <a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
 
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+### Rules of Exponents
+The nine laws for exponents are:
+- x<sup>1</sup> = x
+- x<sup>0</sup> = 1
+- x<sup>-m</sup> = 1/x<sup>m</sup>
+- x<sup>m</sup> * x<sup>n</sup> = x<sup>m+n</sup>
+- x<sup>m</sup> / x<sup>n</sup> = x<sup>m-n</sup>
+- (x<sup>m</sup>)<sup>n</sup> = x<sup>m*n</sup>
+- (x / y)<sup>2</sup> = x<sup>2</sup> / y<sup>2</sup>
+- x<sup>m/n</sup> = <sup>n</sup>√(x<sup>m</sup>)
+
+## 0<sup>0</sup> = ?
+
+0<sup>0</sup> has no correct answear but is generally taken as 1. More information about it can be found [here](https://en.wikipedia.org/wiki/Zero_to_the_power_of_zero)
 
 #### More Information:
+- https://www.mathsisfun.com/algebra/exponent-laws.html
+- https://en.wikipedia.org/wiki/Zero_to_the_power_of_zero
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