exam Maths Puzzle Numerical Ability

find the positive root of the equation 4x^2-36=0

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Hello,
I know the answer to one of these, and the others I'm not sure of. Can you please help me work them out in simplest form?

1) (-5 - √-9^2) answer is 30 + 16i?

2)
6) A right triangle is a triangle with one angle measuring 90°. In a right triangle, the lengths of the sides are related by the Pythagorean Theorem, , where c is the length of th