whats the absolute value?
2007-08-20 16:21:09 · 9 answers · asked by lang1323 2 in Science & Mathematics ➔ Mathematics
Absolute values are a finicky thing. But I'll talk about that later, as we can do something before we tackle it.
|3x-1|+2=7
|3x-1|=5
Now absolute value is defined as |x| = x and |-x| = x. In other words you simply take off the negative. But how do you do it here? Well here if you rewrite the equation you get two equations:
3x-1=5 >>> That's the positive one.
3x-1=-5 >>> That's the negative one, I just divided the entire thing by -1
Now we just solve for x in both equations and those two are our answers.
2007-08-20 16:30:37 · answer #1 · answered by Anonymous · 1⤊ 0⤋
a.) I3x-1I +2 = 7
3x -1 +2 = 7
3x + 1 = 7
3x = 6
x= 6/3
x=2
2007-08-21 00:09:51 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I 3x-1 I +2 =7
I 3x-1 I = 5
3x-1 = 5 or 3x-1 = -5
3x=6 or 3x= -4
x=2 or x = -4/3
2007-08-20 23:27:08 · answer #3 · answered by Rachael A 2 · 2⤊ 0⤋
| 3x - 1 | = 5
3x - 1 = 5 or 3x - 1 = - 5
3x = 6 or 3x = - 4
x = 2 or x = - 4 / 3
2007-08-21 03:22:14 · answer #4 · answered by Como 7 · 0⤊ 0⤋
3x-1=5
x=6/3
x=2
2007-08-20 23:27:12 · answer #5 · answered by PELANGI 2 · 0⤊ 0⤋
Pretend like the abs. value sign isnt even there and solve it that way. You'll get two answers one negative and one positive but theyre both the same number. the answer should be 2 and -2...
2007-08-20 23:27:24 · answer #6 · answered by chickadilly 3 · 0⤊ 0⤋
Can you clarify? Do you want to know what |3x-1| equals or solve for x?
2007-08-20 23:27:05 · answer #7 · answered by juniper 2 · 0⤊ 0⤋
|3x-1|+2=7
3x-1=5
x=2
|3x-1|=-5
3x=-4
x=-4/3
2007-08-20 23:26:54 · answer #8 · answered by de4th 4 · 0⤊ 1⤋
If you are looking to solve for x; then go with Rachael A's answer
2007-08-20 23:32:13 · answer #9 · answered by Paladin 7 · 0⤊ 0⤋