Question

Which of the following is the correct notation for the complex number √-64-12 ?

8i + 12


−12 + 8i


8i − 12


12 − 8i

Answer 1

8i - 12

Explanation:

√-64 - 12

Remember that a unit complex (i) = √-1

So √-64 can be written as √64 × √-1 and it gives 8 × i = 8i

The answer for √-64 - 12 is therefore 8i - 12