Question

Express in terms of i. 4sqrt-225

Answer 1

do you know what 'i' represents?

Answer 2

no the problem just stated express in in terms of i.

Answer 3

have you studied complex numbers?

Answer 4

not that I remember

Answer 5

you need to understand them in order to answer this question.

Answer 6

have a look at this site to get an idea of what they are: http://www.mathsisfun.com/numbers/complex-numbers.html

If you are still stuck after this then let me know which part is confusing and I will try and help you out.

Answer 7

I still confused by the 4 at the begining of the equation

Answer 8

would it be stated like 4i15

Answer 9

that just means multiply the final answer by 4.\[4\sqrt{-225}\]

Answer 10

so yes you got the square root correct \(\sqrt{-225}=-15i\), but you now need to multiply this by 4

Answer 11

sorry \(\sqrt{-225}=15i\)

Answer 12

ok so if the sqrt of -225 is 15i then I multiply that by four so then the answer would be 60i

Answer 13

perfect! well done. :)

Answer 14

ok thank you

Answer 15

yw :)