exam Maths Puzzle Numerical Ability

I just wanted to make sure that

(n-4)^2 = 25

is (1, 9)

or did I do this wrong.

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exam Other Question

A man at ground level measures the angle of elevation to the top of a building to be 53 degrees. If, at this point, he is 12 feet from the building, what is the height of the buil This problem is not from my textbook it is a worksheet problem.
Use Descartes�s rule of signs to discuss the possibilities for the roots of the equation.
4x3-9x2+2x+3=0