Question

What's the rule for parenthesis x to the a parenthesis to the b?

Answer 1

$\Huge \left(x^a\right)^b = x^{a*b}$

This is basically saying "if you raise an exponent to another exponent, then you multiply the exponents. The product is the new exponent"

For example

$\Huge \left(x^2\right)^3 = x^{2*3} = x^6$