Option 2: 18-5i is the right answer
Step-by-step explanation:
Given
[tex]18-\sqrt{-25}[/tex]
When there is a negative number in radical, a new complex number iota denoted by i is introduced which is equal to [tex]\sqrt{-1}[/tex]
So we will solve the given expression
[tex]18-\sqrt{-25}\\= 18- (\sqrt{25*-1})\\= 18 - (\sqrt{25} * \sqrt{-1})\\= 18 - (5*i) = >\sqrt{-1} = i\\= 18 - 5i[/tex]
Hence,
Option 2: 18-5i is the right answer
Keywords: Iota, complex numbers
Learn more about complex numbers at:
- brainly.com/question/5500978
- brainly.com/question/550017
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