book Maths Puzzle Numerical Ability

(a+ib)^2

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book Other Question

The sum of two numbers is 23. Twice the greater number added to three times the smaller number is 57. Find the numbers. I have been working on this all day. could someone explain this problem to me i am working with adding and subtracting rational expressions with different denominators.

4x/2x^2 + x - 10 - 9x/x^2 + x - 6