exam Maths Puzzle Numerical Ability

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Problem #22
Solve
-9(x-3)^2 = -7

Problem #33
Solve by completeing the square
2x^2-4x-11=0

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exam Other Question

i need to find out if 5-2x over x2 is a rational expression Hello. I really do appreciate what you do here, and this is definately one quesion that i will ever bothr you with.

Would you be able to simplify

arccos(sin(5pi/4))