Question

Please help! Variables!!

Answer 1

-x^4, and (2√x)/x

Explanation:

4.
`- \sqrt{ x^(8) } = - \sqrt{x^(4) *x^(4) } = -x^(4)`

x^8 = x*x*x*x*x*x*x*x = (x*x*x*x)(x*x*x*x) = (x^4)(x^4)

5.

`\sqrt{(4)/(x) } = (√(4) )/(√(x) ) = (2)/(√(x) ) \\\\\\(2)/(√(x) ) * (√(x) )/(√(x) ) = (2√(x) )/(x)`