Solve x2 = −169

A. undefined
B. 13
C. ±13
D. −13

There are no two same numbers that multiply to each others and get negative numbers.

You also notice if we proceed to find x further. - 169 will be in square root which is not possible for real number. Hence, the answer is undefined.

For further explanation, this will be imaginary roots.

However, these roots are not in real number system. These roots are imaginary.

But since imaginary roots aren't in the choices. Therefore the answer is undefined.