book Maths Puzzle Numerical Ability

square root of negative x cube

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book Other Question

Evaluate b2 - 2bc + c2 if b = 3 and c = -2.

im coming up with 17..am i right What size square can be inscribed in a circle of radius 8 inches. I am assuming to use pythagoran theorem which I know 8^2 will probably be the c^2 but I'm not sure how to figure o