Can someone please help me?
2007-06-22 14:42:54 · 7 answers · asked by Amanda B 1 in Science & Mathematics ➔ Mathematics
Your equation is unclear.
Possibility 1:
√(20) /5 - 1/√(5)
2√(5)/5 - 1/√(5)
2/√(5) - 1/√(5)
Answer: 1 / √(5)
Possibility 2:
√(20/5) - 1/√(5)
√(4) - 1/√(5)
2 - 1/√(5)
10 / 5 - √(5) / 5
Answer: (10 - √(5) ) / 5
2007-06-22 15:31:16 · answer #1 · answered by сhееsеr1 7 · 0⤊ 0⤋
â4-1â5
= 2-â5
2007-06-22 22:04:57 · answer #2 · answered by wabawuby 2 · 0⤊ 0⤋
â20/5 - 1/â5
Multiply the second term top and bottom by â5 =
â20/5 - â5/5
â20 = â4*â5 = 2â5
So, â20/5 - â5/5 = 2â5/5 - â5/5 = â5/5
2007-06-22 21:52:55 · answer #3 · answered by Steve A 7 · 0⤊ 0⤋
â20/5-1/â5 is the problem.
First we rationalize the denominator of 1/â5, so you multiply 1/â5 by â5/â5, which becomes 1â5/5, so now you can subtract with â20/5
(â20-â5)/5
â20 can be simplified to 2â5.
When you subtract radicals, you subtract whats outside the radical, and only it the radical is same( â2,â2).
so the answer is â5/5.
2007-06-22 23:04:56 · answer #4 · answered by abcd 2 · 0⤊ 0⤋
sqrt(20) = sqrt(4*5) = 2* sqrt(5)
Therefore, the whole expression becomes:
2 * sqrt(5)/5 - 1/sqrt(5) =
2/sqrt(5) - 1/sqrt(5) =
1/sqrt(5)
2007-06-22 21:49:18 · answer #5 · answered by HZ 2 · 0⤊ 1⤋
2-sqrt5 /5
2007-06-22 21:49:24 · answer #6 · answered by Anonymous · 0⤊ 2⤋
a calculator would do the trick
2007-06-22 21:45:33 · answer #7 · answered by ....... 3 · 0⤊ 2⤋