exam Maths Puzzle Numerical Ability

what value should K be to make the following expression a perfect sum of squares:

2K(x)^2 - 24xy + 9(y)^2

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exam Other Question

Every day at noon a ship leaves Los Angeles for Singapore, and at the same instant a ship leaves Singapore for Los Angeles.

Each trip lasts exactly eight days.

How many How do you solve the following quadratic equation: x^2 - 49 = 0