which of the following is equivalent to 18-√-25

A) 18 – 5i

B) 23

C) 5i

D) 18 +5i

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Answer: A) 18 – 5iExplanation:

Given number is in Complex form 18-√-25 to simplify this expression

for simplification divide the complex number into two parts (real and imaginary number).

given expression “18” is real number and “√-25” is imaginary number

To solve the square root of √-25

18 – √-25 = 18 – √25(-1)

18 -√25 (√-1) = 18 – 5(√-1)

For imaginary numbers, √-1 = i. Using that relation, simplify the expression is 18 – 5i

Hence, the answer option

A) 18-5i