Question

Multiply sqrt(-2) * sqrt(-16)
can someone please help me with this one.

Answer 1

\[\sqrt{-2}=i \sqrt{2}\]
\[\sqrt{-16}=i \sqrt{16}=i \cdot 4= 4i\]

Answer 2

Now multiply

Answer 3

@eigenschmeigen a and b >=0 in order for that to be true

Answer 4

good point. i thought something fishy was going on when i wrote that..

Answer 5

\[i \sqrt{2} \times 4 i\]

Answer 6

so is i√2*4i the final answer?

Answer 7

remember i x i = -1

Answer 8

so -1*4i

Answer 9

don't forget your sqrt(2) part

Answer 10

and that extra i shouldn't be there

Answer 11

so after the i√2*4i what do i put. can you do step by step and explain to me from start to finish

Answer 12

\[i \sqrt{2} \times 4i = i \times i \times \sqrt{2} \times 4 = -1 \times 4\sqrt{2} = -4\sqrt{2}\]

Answer 13

\[i \cdot \sqrt{2} \cdot 4 \cdot i =i \cdot i \cdot 4 \cdot \sqrt{2} \text{ b/c multiplication is communative }\]

Answer 14

lol oops i'm too late

Answer 15

hehe i was speedy

Answer 16

you guys are great. It has been a long time for me

Answer 17

so now can you tell me how you got all this i am kind of lost

Answer 18

\[\sqrt{-1}=i\]

Answer 19

ok so what is the final answer for the whole problem ?
by the way i like your pic, thats cute how do i put something on mine