2007-11-09 17:53:34 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
sqrt 20 =2*sqrt 5
so divide by 2 to get sqrt 5
2007-11-09 18:01:29 · answer #1 · answered by Anonymous · 1⤊ 1⤋
â20 = â5*4 = â5*2*2 = â5 * 2 = 2â5
2007-11-10 05:07:33 · answer #2 · answered by A Little Sarcasm Helps 5 · 0⤊ 1⤋
Square root (20) = square root(4*5) because we can factor under the radical: 20 = 4*5
When you factor the radical, you can break it into 2 radicals multiplied by each other:
Square root(4*5) = square root(4) * square root(5)
Since square root(4) = 2, we get
2 * square root(5)
So all together, you have 2 * square root(5) / 2. The twos cancel because of the division sign, so you are left with
square root(5)
2007-11-10 02:27:50 · answer #3 · answered by dave_rosko 3 · 0⤊ 2⤋
square root of 20 = 4.47213595499955793928183473374626 /2 =
2.2360679774997896964091736687313 which is equal to the square root of 5
2007-11-10 02:42:00 · answer #4 · answered by jasmine d 7 · 0⤊ 2⤋