Question

What is the square root of -1?

A. -i
B. i
C. -1
D. 1

Answer 1

It would be B. i.

Explanation:

In math they have "imaginary" numbers that take away a negative, and it is i. And just like if you have x, the number goes into the letter, but it's still there. -1 is not a valid number to square root, and if you input it into a calculator it brings up invalid input. The square root of 1 is 1, so you use i to take away the negative, then you are left with 1i or just i.

Answer 2

B. i

Explanation:

There is no real number that multiplies by itself to give us -1 so we have to go into the complex numbers. We know that the square root of -1 is the imaginary number i