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iren2701 [21]
3 years ago
7

Which of the following is evaluated to 18-√-25? 1) 5i 2) 18-5i 3) 18+5i 4) 23

Mathematics
1 answer:
xz_007 [3.2K]3 years ago
6 0

Option 2: 18-5i is the right answer

Step-by-step explanation:

Given

18-\sqrt{-25}

When there is a negative number in radical, a new complex number iota denoted by i is introduced which is equal to \sqrt{-1}

So we will solve the given expression

18-\sqrt{-25}\\= 18- (\sqrt{25*-1})\\= 18 - (\sqrt{25} * \sqrt{-1})\\= 18 - (5*i) = >\sqrt{-1} = i\\= 18 - 5i

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

#LearnwithBrainly

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