book Maths Puzzle Numerical Ability

How do I find the complex solution to the quadratic equations.

x^2 + 6x + 10 = 0

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book Other Question

The sum of two numbers is 240.The larger number is 6 less than twice the smaller. find the numbers how many liters of water must be added to 8 liters of a 40 percent acid solution to obtain a 10 percent acid solution?