exam Maths Puzzle Numerical Ability

how do you solve (2-5i)^2

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exam Other Question

I have no idea how to type in math problems - (i.e., Squared, etc.)
My problem is finding the LCD and steps to solve reational expressions.
7x + 1 divided by x squared minus 9 (minus) 5 divided by x minus 3
Thank you! Please help! The length of a rectangle plus its width is 40m. The area is 336 square meters. How long is the longest side of the triangle?