Question

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Answer 1

Answer: 6i

Explanation:

√(- 36) + 7i - √(- 49)

= 6i + 7i - 7i

(As i = √- 1)

= 6i

More about complex numbers and unreal number: A complex number is a number in form of $x + iy$ where x, y are real numerical coefficients and i (iota) = √-1. Any unreal number is in form of $bi$ where b ∈ R and i = √-1.