Question

Solve x2 = –169.

undefined
13
±13
−13

Answer 1

@GracyGirl

Answer 2

Have you learned about 'i'?

Answer 3

If not, the answer is undefined, two of the same numbers multiplied together can't be negative.

Answer 4

\[x^2=169=169 \times-1=169 \times \iota ^2,x=\pm 13 \iota\]

Answer 5

iota is an imaginary number.