Question

Which of the following is equivalent to ________?
5i
18 – 5i
18 + 5i
23

Answer 1

i=$\sqrt{- 1}$

so 18-5i is your answer

Answer 2

Answer:

18-5i

B is correct.

Step-by-step explanation:

Given: $18-\sqrt{-25}$

Simplify the given expression

Inside the square root negative number.

Using complex concept.

$\sqrt{-1}=i$

$\sqrt{-25}=\sqrt{25}\cdot\sqrt{-1}$

$\sqrt{-25}=5i$

Substitute the value into original equation.

$18-\sqrt{-25}\Rightarrow 18-5i$

Hence, The equivalent expression is 18-5i