exam Maths Puzzle Numerical Ability

sqrt (-36) simplify please help me learn this and show all work.

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exam Other Question

The path of a rocket is represented by the equation y=x^2 + 2x + 1. The path of a missle designed to intersect the path of the rocket is represented by the equation y= the sq.rt. find x intercepts y=x^2-2x+4 could you show all steps i am having a hard time with this