Question 531816
simplify"
this please:
^4 sqrt x^-28 
Assume the problem is the 4th root of x^-28, written here like this: 
{{{4sqrt(x^-28)}}}
remember you can always get rid of negative exponent using it's reciprocal
{{{4sqrt(1/x^28)}}}
In order to understand this we can write it
{{{4sqrt((1/x^4) * (1/x^4) *(1/x^4) *(1/x^4) *(1/x^4) *(1/x^4) *(1/x^4))}}}
extract the 4th root of each and we have
{{{(1/x) * (1/x) *(1/x) *(1/x) *(1/x) *(1/x) *(1/x) }}}
which is
{{{1/x^7}}}
:
But we can sum all this up in one sentence, the 4th root of the 28th power = 7