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Solving Quadratic Equations

From a textbook:
Solve the following equation for x

49x^-5/8 - 8/7x^7/8 = 0

I reached an answer of 4/49 but the textbook gives an answer of 49/4 - ?printing error or have I got something wrong?

Also I would like some clarity with the following - I have only sort of got them right.

1. x^2/3 - x^1/3 - 2 = 0. Answer given 8 and -1

2. x^1/2 -5x^1/4 + 6 =0. Answer given 16 and 81

Solution Summary

Quadratic equations are solved.

$2.19