Question

Simplifi the number using the imaginary unit i.
sqrt-28
@Cosmichaotic

Answer 1

I have no idea how to do this!

Answer 2

do you know how to find the sqrt of 28?

Answer 3

yeah its 5.2?

Answer 4

But from there Im confused.. :/

Answer 5

@nikato

Answer 6

I doubt they want you to use the decimal form of sqrt 28. Do you know how to break it down so it stays in reduced radical form?

Answer 7

i think its best that we leave in radicals.

can you factor 28?

Answer 8

they want one of these:
2sqrt-7
-2sqrt-7
isqrt28
2isqrt7

Answer 9

ok. first think. what two numbers multiply gives you 28

Answer 10

4 and 7?

Answer 11

so the 2 goes outside and the 7 inside so one of these?
2isqrt7? i think its this one!

Answer 12

@nikato

Answer 13

correct!

Answer 14

Thank you so much!

Answer 15

no problem