Question

Simplify √-121
√ = radical symbol

Answer 1

as told earlier :
\(\sqrt{-1}=i\)
so, \(\sqrt{-121}=\sqrt{-1}\sqrt{121}=..?\)

Answer 2

Where did the 'i' come in at ?!?!

Answer 3

i is actually the square root of negative 1, so i slpit square root of negative 1 in to 2 parts, one having 'i'.

Answer 4

My choices are
a. -11i
b.11i
c.-11
d. 11

Answer 5

*split square root of -121...

Answer 6

Is th answer 11

Answer 7

ok, out of the 2 parts here
\(\sqrt{-121}=\sqrt{-1}\sqrt{121}=..?\),
1st part equals 'i'
what does 2nd part square root of 121 equal ??
and no.

Answer 8

I don't know how to do square root.... I don't have a calc and I just want the answer :)

Answer 9

but you have google :)
type in square root of 121.....

Answer 10

It told me 11..

Answer 11

thats correct.
so \(\sqrt{-121}= i \times 11\)

Answer 12

soooo 11i ?

Answer 13

yup.

Answer 14

What aboutttt \[\sqrt{-72}\]

Answer 15

same way,
\(\sqrt{-72}=\sqrt{-1}\sqrt{72}=i \times \sqrt{72}\)
you just need to simplify, square root of 72

Answer 16

8.48528137424....

Answer 17

but i think your choices will have radicals in them.

Answer 18

My choices are
a. \[-6\sqrt{2}\]
b. \[6\sqrt{-2}\]
c.\[6\sqrt{2i}\]
d.\[6i \sqrt{2}\]

Answer 19

can you factor 72 ?

Answer 20

I don't know how to factor..
Isn't that where you find 2 of the GCF ?

Answer 21

72 = 2*36
and whats the square root of 36 ?