simplify the expression
1. sqrt (5) ( 6sqrt(2) - sqrt(5) )
2. 4/sqrt(20)
solve the equation
3. sqrt (3x) - 6 = 0
2007-07-04 10:15:57 · 5 answers · asked by Berry A 2 in Science & Mathematics ➔ Mathematics
1. 6√5*√2 - √5*√5 = 6√10 - 5
2. √20 = 2√5
now, 4/√20 = 4/(2√5) = 2/√5 *(√5/√5)=(2√5)/5
3. √3x = 6 then square both sides. finish it.
d:
2007-07-04 10:28:37 · answer #1 · answered by Alam Ko Iyan 7 · 0⤊ 0⤋
put these 1. 2 into your calculator
3. sqrt 3x = 6 (square both sides)
3x = 36
x = 12
2. 4 / sqrt 20
16 / 20
4 / 5
1. calculator
2007-07-04 17:20:01 · answer #2 · answered by Anonymous · 0⤊ 0⤋
for 2. it is 1/sqrt (5), and the answer for 3>is 36 for x. Best I can do for 1. is (sqrt (5)/sqrt(6)) - 1 if that is any simpler.
2007-07-04 17:30:30 · answer #3 · answered by glen 2 · 0⤊ 0⤋
1.
sqrt (5) ( 6sqrt(2) - sqrt(5) )
= 6sqrt(5)sqrt(2) - sqrt(5)sqrt(5)
= 6sqrt(10) - 5.
2.
4/sqrt(20)
4 / sqrt(5)sqrt(4)
= 4 / 2sqrt(5)
= 2 / sqrt(5)
Multiplying top and bottom by sqrt(5) gives:
2sqrt(5) / 5.
3.
sqrt (3x) - 6 = 0
Add 6:
sqrt(3x) = 6
Square:
3x = 36
Divide by 3:
x = 12.
2007-07-04 17:29:35 · answer #4 · answered by Anonymous · 0⤊ 0⤋
1.
6Sqrt(5)Sqrt(2)-5
6 Sqrt(10) - 5
2.
4 / Sqrt (20)
4 / Sqrt (4*5)
2 / Sqrt (5)
3.
Sqrt 3x = 6
3x = 36
x = 12
Surds for Nerds !
2007-07-04 17:28:34 · answer #5 · answered by Anonymous · 0⤊ 0⤋