What are the square roots of 324?

A.
162 and –162

B.
19 and –19

C.
18 and –18

D.
16 and –16

Question

What are the square roots of 324?	
 
 A.
162 and –162
 
 B.
19 and –19
 
 C.
18 and –18
 
 D.
16 and –16

turingtest · Answer

you can do this by trial-and-error
is 162*162=324 ?
try each one...

linn99123 · Answer

so i just times each number by its self?

turingtest · Answer

yup, that's what it means to "square a number"
the square root of a number is another number that, times itself, equals the number we started with

linn99123 · Answer

wait im confused 162*162 aint 324

linn99123 · Answer

so is it c?

turingtest · Answer

hm... mist not be the right answer then
we want the number, that times itself, equals 324
so yes, 18 is the square root of 324, because 18x18=324

turingtest · Answer

and because a negative times a negative is a positive, it is also true that (-18)x(-18)=324, hence you have two sqare roots of each positive real number

linn99123 · Answer

o ok thank u so much :D

turingtest · Answer

welcome