book Maths Puzzle Numerical Ability

I do not understand how to do the Quadratic Equation r2(squared) + 10r + 9 =0

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In triangle ABC, the length of side BC is 2 inches and the length of side AC is 10 inches. What is one possible length of side AB, in inches? 3 groups of people were hired to work during a special promotion campaign for a laundry detergent. The first group is twice as large as the second, and the third is as large as the