book Maths Puzzle Numerical Ability

Solve.

x^2-2x=-13

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book Other Question

Need help with this, The inlet pipe of an oil tank can fill the tank in 1 hour, 30 minutes. The outlet pipe can empty the tank in 1 hour. How long does it take to empty the tank if both pipes are open? Suppose C=(2,8,9), D=(4,8,12), and E=(6,8,9).
a. Find (C union D)intersection E b.Find C union(d intersection E)