book Maths Puzzle Numerical Ability

Can you explain how to solve 8x^2-6x-9=0?

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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!!!!!!!!!!!!
Hi, I was wondering if I could submit multiple problems within a day because I'm really struggling with math?how long does it usually take for you to reply with the answer and betw