Question

im still having trouble with square roots please help!!!!

Answer 1

where is your question?

Answer 2

\[\sqrt{-18 \sqrt{-72}}\] but the first square root symbol covers the 18 only, they are seperate

Answer 3

These are imaginary numbers. Have you learned basic square roots already?

Answer 4

\[\sqrt{-18}\times \sqrt{-72}\]

Answer 5

yes and i thought i understood it but i handed in some work and recently got it all wrong

Answer 6

@satellite73 thats right

Answer 7

ok so with these squareroots there is something new... they have introduced a - sign under the sign!!

Answer 8

\[\sqrt{-18}=\sqrt{9}\times \sqrt{2}\times \sqrt{-1}=3\sqrt{2}i\] might be a start

Answer 9

repeat the process for \(\sqrt{-72}\) and then multiply the results together

Answer 10

\[ \sqrt{9} \sqrt8 \times \sqrt{-1}\] =3\[\sqrt{8i}\]

Answer 11

is that the 72 part???

Answer 12

now quite good enough i am afraid, since \(8=4\times 2\)

Answer 13

try maybe \(-72=36\times 2\times -1\)

Answer 14

okay i guess i was thinkin 8*9 i see now

Answer 15

it is true that \(8\times 9=72\) but you are still left with a perfect square lurking inside of \(8\)

Answer 16

\[3\sqrt{2i} \times 6\sqrt{2i}\]