book Maths Puzzle Numerical Ability

Please!

help me out with this equation from the GRE ETS book .... I don't understand the result.

2^30 - 2^29
____________ = 2^28
2

THANK YOU SO MUCH!!!!!!!!!!!!

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book Other Question

How do I solve this equation using the quadratic formula

3-4/x-2/x2=0

THREE - FOUR OVER X - TWO OVER X SQUARED = ZERO
x = (3x-5)
2 4


I have tried every thing and cant figure it out please help