Question

How do you do this stuff?

Answer 1

I my friend, have no idea...

Answer 2

\[\sqrt{-5}*\sqrt{-45}\]

Answer 3

√(-5) * √(-45)
= √((-5)*(-45))
= √225

Answer 4

\[i \sqrt{5}*i \sqrt{45}\]

Answer 5

like how
√3 * √3 = √(3*3) = √9 = 3

Answer 6

So you can do that even though it is 2 negatives?

Answer 7

negative times negative equals positive, right?

Answer 8

Right

Answer 9

wait, nevermind, it does have to do with imaginary...
give me a sec :/

Answer 10

√(-5) * √(-45)
= i√5 * i√45
= i√5 i * √9*5
= i√5i * 3√5
= i^2 * 3 * 5
= -1 * 3 * 5
= - 15

Answer 11

How do you get 3*5 from the 4th step?

Answer 12

3 * √5 * √5 * i * i
= 3 * 5 * i^2
sorry if it was a bit crunched

Answer 13

OHH! Thanks!