I cant seem to get these 2 questions right.

1) the problem:

the attempted solution:

* I rewrote the problem as $\displaystyle 19\; \left( x^{3} \right)^{\frac{1}{2}}+14\left( x^{2} \right)^{\frac{1}{3}}$

and went from there. no dice.

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the second.

problem:

the attempted solution:

I finished the division and got $\displaystyle \frac{5}{y^{2}}+3y^{4}$

then proceded as normal but the resulting answer didnt work. Any hints? thanks a bunch.