Evalute the given definite integral

Please show workings so i can see where I may be going wrong.

limits (3,SQRT 5) 2z x 4th root of z^4+8z^2+16 dz

put x=z^2 dx=2zdz limits(9,5)

limits (9,5) 4th root of (x+4)^2 dx
put x=z^2 dx=2zdz limits(9,5)

limits (9,5) (x+4)^1/2 dx
2/3(x+4)^3/2 apply limit 2/3*13^3/2-2/3*27=2/3*13^3/2-18