i know the answer is 2sqrt5 but how do you get that?
2006-06-12 14:56:08 · 16 answers · asked by BeAuTiFuL 6 in Science & Mathematics ➔ Mathematics
2√5
if you have √20 its √4*5
√4 is 2
so you have 2√5
2006-06-12 17:30:48 · answer #1 · answered by ♥ The One You Love To Hate♥ 7 · 6⤊ 2⤋
5
2006-06-12 22:00:20 · answer #2 · answered by cynthia c 1 · 0⤊ 0⤋
first the 4.4444 is only an estimation. you need to find two numbers that can be derived from 20 one has to have a number that u can take out a perfect square like 9 is to 3, 16 is to 4 and 25 is to 5 in this is 4 is to 2, then the other number which would not be a perfect square has to stay inside the square root sign.
2006-06-13 01:11:57 · answer #3 · answered by B9O9R9I9C9U9A 3 · 0⤊ 0⤋
The square root of 20 is the side length of a square with an area of 20
2006-06-12 22:11:14 · answer #4 · answered by Greyhound_Guy 2 · 0⤊ 0⤋
20 = 4*5
Square root of (4*5) = Sqrt4 * Sqrt5
Therefore, Sqrt20 = 2*Sqrt5, or 2sqrt5
2006-06-12 21:59:50 · answer #5 · answered by LadyJag 5 · 0⤊ 0⤋
Root of products is equal to product of roots, or
(nth rt)(ab) = (nth rt)(a) x (nth rt)(b)
you know that 20 = 4 x 5, so
sqrt(20)
= sqrt(4 x 5)
= sqrt(4) x sqrt(5)
= (2) x sqrt(5)
= 2sqrt5
^_^
2006-06-13 06:15:12 · answer #6 · answered by kevin! 5 · 0⤊ 0⤋
sqrt20
sqrt(4*5)
2sqrt5
2006-06-12 21:58:54 · answer #7 · answered by Mike B 3 · 0⤊ 0⤋
sqrt 20
sqrt(4*5)
2 sqrt 5
OR
= â20
= â4*5
= â2*2*5
= 2â5 ANS
2006-06-13 02:37:09 · answer #8 · answered by Anonymous · 0⤊ 0⤋
root of 20 is equal to sqrt of (4*5)
this is equal to [sqrt 4]*[sqrt 5]
we know that sqrt 4 = 2, so
[root 4]*[root 5] =
2 * (sqrt 5)
2006-06-12 21:59:59 · answer #9 · answered by ledezmajr 3 · 0⤊ 0⤋
You can re-write sqrt(20) as sqrt(4) * sqrt(5). Since sqrt(4)=2, you're left with 2*sqrt(5). Get it?
2006-06-12 21:58:50 · answer #10 · answered by Anonymous · 0⤊ 0⤋