3/4x -6(2-5x) = 120
2007-06-20 00:36:26 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
3/4x - 6(2 - 5x) = 120
3/4x - (12 - 30x) = 120
3/4x - 12 + 30x = 120
4(3/4x) - 4(12) + 4(30x) = 4(120)
3x - 48 + 120x = 480
123x - 48 = 480
123x - 48 + 48 = 480 + 48
123x = 528
123x / 123 = 528 / 123
x = 528/123
x = 4 36/123
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2007-06-20 01:18:29 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
3/4x - 6(2-5x) = 120
=> 3/4x - 12 + 30x = 120
=> 123/4x = 108
=> 123 = 432x
x = 432/123
x = 3.512
2007-06-20 07:47:55 · answer #2 · answered by Anonymous · 0⤊ 0⤋
is the 3 over all 4x or just (3/4)x?
for the first option, 3/4x-12+30x=120
multiply everything by 4x, 3-48x+120x^2=480x
120x^2-528x+3=0
40x^2-176x+1=0
use quadratic formula, x= .006 and 4.394
for the second option, (3/4)x-12+30x=120
(123/30)x=132
x=132(30/123)
x=1320/41
2007-06-20 07:46:26 · answer #3 · answered by hrhbg 3 · 1⤊ 0⤋
3/4x -6(2-5x)=120
3/4x-12+30x=120
+12 +12
3/4x+30x=140
30&3/4x=140
4/123 (123/4x=140) 4/123
x=560/123
2007-06-20 08:44:56 · answer #4 · answered by curiosity2414 1 · 0⤊ 0⤋
3/4x -6(2-5x) = 120
3/4x -12+30x=120
123/4x= 132
x=132*4/123
x=528/123
2007-06-20 07:57:54 · answer #5 · answered by Anonymous · 0⤊ 0⤋
This is just like the last 2 problems you asked us to help you with. Do the same thing. Follow the guidelines given you a few minutes ago.
2007-06-20 07:40:37 · answer #6 · answered by SheTigger2 4 · 0⤊ 0⤋
x=176/41
2007-06-20 07:47:40 · answer #7 · answered by Anonymous · 0⤊ 0⤋
3/4x-6(2-5x)=120
3/4x-12+30x=120
3+120x^2=528x
120x^2-528x+3=0
40x^2-176x+1=0
x=1/80[176+/-sqrt(176^2-160)]
=1/80[176+/- 175.54]=1/80[351.54,0.46]=4.39,.0058answer
2007-06-20 08:05:10 · answer #8 · answered by Anonymous · 0⤊ 0⤋