exam Maths Puzzle Numerical Ability

Solve the following quadratic equation by completing the square.
2x^2+10x+11=0

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exam Other Question

Your boat will go 15 miles per hour in still water. If you can go 12 miles downstream in the same amount of time it takes to go 9 miles upstream, then what is the speed of the current? r-5 (times the square root of r) - 36 = 0