|3x + 4| - 7 = 18
In this absolute value equation, the first step is to isolate the absolute value signs by adding 7 to both sides of the equation.
Yes
No
2006-11-15 05:05:10 · 9 answers · asked by martty l 1 in Science & Mathematics ➔ Mathematics
yes
|3x +4| =25
|3x| = 21
x= +7 or -29/3
2006-11-15 05:12:29 · answer #1 · answered by Curious Blair 3 · 1⤊ 1⤋
You are correct that the first step gives
|3x + 4| = 25
Now since the absolute value of 3x + 4 is 25, the actual value could be either 25 or -25.
So the possible values of x are 7 or -29/3
2006-11-15 13:21:53 · answer #2 · answered by tringyokel 6 · 0⤊ 0⤋
Answer x = 7
3x + 4 -7 =18
Add 7 to both sides
3x + 4 -7+7 = 18 +7
Therefore 3x +4 = 25
Now subtract 4 from both sides
3x +4 -4 = 25 -4
Therefore 3x =21
To find the value of x, divide both sides of the equation by 3.
Therefore x = 21
2006-11-15 13:15:34 · answer #3 · answered by doc 1 · 0⤊ 0⤋
Yes. So you will then have: 3x + 4 = 25
Then subtract 4 from each side, you then have: 3x = 21.
So x = 7. :-)
2006-11-15 13:13:53 · answer #4 · answered by frenchy62 7 · 0⤊ 0⤋
Yes
Curious Blair - it can't be negative if it is an absolute value!
2006-11-15 13:13:11 · answer #5 · answered by ve1luv 2 · 0⤊ 0⤋
yes
2006-11-15 13:06:58 · answer #6 · answered by Brian 2 · 0⤊ 0⤋
correct
2006-11-15 13:13:40 · answer #7 · answered by Wibble 4 · 0⤊ 0⤋
YES!
2006-11-15 13:09:05 · answer #8 · answered by deadgrl6 2 · 0⤊ 0⤋
yes...
2006-11-15 13:06:59 · answer #9 · answered by ? 3 · 0⤊ 0⤋