book Maths Puzzle Numerical Ability

What is the answer to 6x^2+7x-20=0

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book Other Question

how would i simplfy a probem withradican 180/radican 9? The letters a, b, c, and d will be used to form passwords for the schools computer system. How many 4 letter passwords maybe formed if the letters can be used more than once in any passwrd?