Question

which of the following are square roots of the number below ?
81
a. 81^1/2
b.18
c.9
d.-(81) ^1/2 ?

Answer 1

sqrt of a no. is that, which when when multiplied by itself, gives the original no. so if 'a' is a sqrt of 'b', the a^2=b

now what do you think would the answer be??

Answer 2

c.

Answer 3

a too

Answer 4

and, D too. can you think why?
so its ACD

Answer 5

d is not

Answer 6

\[\sqrt{-81}= i \sqrt{81}\]
square this and u get -81