# please explain why ?

Write following in the form bi, where i=square root of {-1}.

Square root of 121.

-answer 11 was wrong.

### 4 Answers

- Φ² = Φ+1Lv 79 months ago
GIven the preamble/set up "Write following in the form bi, where i=square root of {-1}.", balance of probabilities are in favour of the idea that the next part being "Square root of -121.".

You wrote the correct answer to the given question. It isn't your fault it was the wrong question. Maybe the answer was looking for the answer to my part of the question, not the given part.

- llafferLv 79 months ago
Is that :

√121

If so, then 11 is the correct answer as you usually don't include the complex part if it simplifies to 0. If they really want it in (a + bi) form, the answer could be written as:

11 + 0i

Or is that really:

√(-121)

Which then we do have a complex result with no real value. The answer simplifies to:

11i

But if you need it in (a + bi) form, you could add the real zero to it:

0 + 11i

- Anonymous9 months ago
A hot maths teacher can provide a square root