2007-07-14 05:25:12 · 5 answers · asked by cw21 1 in Science & Mathematics ➔ Mathematics
Hey there!
Here's the answer.
5sqrt(5)-sqrt(20) -->
5sqrt(5)-sqrt(5)*sqrt(4) -->
5sqrt(5)-2sqrt(5) -->
3sqrt(5)
So the answer is 3sqrt(5).
Hope it helps!
2007-07-14 05:37:07 · answer #1 · answered by ? 6 · 0⤊ 0⤋
= 5â5 - 2â5
= 3 â5
2007-07-14 13:27:54 · answer #2 · answered by Como 7 · 0⤊ 0⤋
since srt 20 is srt (4*5), this is
5 srt 5 - srt(4*5), or
5 srt 5 - srt(4)*srt(5), or
5 srt 5 - 2 srt(54), or
3 srt 5
2007-07-14 12:33:25 · answer #3 · answered by anobium625 6 · 0⤊ 0⤋
so the trick here is to recognize that 20=4*5=2*2*5
so sqrt(20)=sqrt(2*2*5)=2sqrt(5)
so 5sqrt(5)-sqrt(20)=5sqrt(5)-2sqrt(5)=3sqrt(5)
2007-07-14 12:30:12 · answer #4 · answered by careyschwartz 2 · 0⤊ 0⤋
5sqrt(5) - sqrt(20)
5sqrt(5) - sqrt(5)*sqrt(4)
5sqrt(5) - 2sqrt(5)
3sqrt(5)
2007-07-14 12:30:08 · answer #5 · answered by Anonymous · 1⤊ 0⤋