exam Maths Puzzle Numerical Ability

Please help me solve this problem

Write each expression as a complex number in the form of a + bi

5i - the square root of -84.

Thanks!

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exam Other Question
Find three consecutive odd integers such that the sum of the first and third integers is twice the second integer. 16 2(x-4)
--- + ------
x2-16 x+4

Adding Rational Expressions