Question

(x^-4 * x^-6)^-2
^ significa elevado

Answer 1

(x^-4 * x^-6)^-2
(x^-10)^-2
x^20

Answer 2

$( {x}^{ - 4} . {x}^{ - 6} ) {}^{ - 2} = ({x}^{ - 10} ) {}^{ - 2} \\ = {x}^{( - 10)( - 2)} = {x}^{20}$