exam Maths Puzzle Numerical Ability

Could someone help me solve the following equation:
4x^2-11x-3=0
Thanks

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exam Other Question

A is eleven times as old as B. in a certain number of years, A will be five times as old as B, and in five years after that she will be three times as old as B. how old are they now. A college student pays $280 for a three hour course. How much would he have to pay for a class load of 16 hours? Round your answer to the nearest whole dollar. Be sure to put a dollar sign ($) on your answer.__________