Question:

Help in choosing the choices that equivalent to the expression?
√-49 a. i√49 b. -√49 c. -7 d. 7i I feel that option D is the only answer that would fit it. I need some input please and thank you!

Answers:

A-Best: A and D are equivalent, but D is in a simpler form than A.  

A: a and d are both right  

A: over 9000  

A: i means imaginary number which is usually a negative square root. So A is right answer