Question

Which expression is equal to 2√-28

Answer 1

b) 4i√7

Explanation:

Given problem,

→ 2√-28

Let's solve the given problem,

→ 2√-28

→ 2√(-1) × √(28)

→ 2i × √(4) × √(7)

→ 2i × 2 × √7

→ 4i√7

Hence, option (b) is correct.

Answer 2

• B)
  `4i√(7)`

--------------------------

We know that:

• 
  `i = √(-1)`

Therefore the given expression is simplified as:

• 
  `2√(-28) =2√(-1*4*7) =2i√(4) √(7) =2i*2√(7) =4i√(7)`