Help please

I dnot un,dderstand...

√h³ = √h•h•h = (√h•h)(√h) = h√h

√8 = √4•2 = (√4)(√2) = 2√2

final result is h√h over 2√2

$\dfrac{\sqrt{h^3}}{\sqrt{8}}\\ =\dfrac{h\sqrt{h}}{2\sqrt 2}\\ =\dfrac{h\sqrt{2h}}{4}$