book Maths Puzzle Numerical Ability

12n^2+8n=0

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book Other Question

could you help me with this equations, im stuck!!!

3x-5=2x

could you show me how i can solve this equation.
please!!!
Thanks
The distance seen in miles from a height of h feet on Earth is d = square root 3h / 2 . If we can see approximately 35 miles from the top of the Cityspire in New York, estimate i