2007-01-09 05:12:02 · 15 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
First: combine "like" terms: subtract "x" from both sides (opposite sides means opposite sign) >
3x - x = x - x
2x = 0
Sec: solve for "x" by isolating it on one side > divide both sides by 2 >
2x/2 = 0/2
x = 0
2007-01-09 05:20:00 · answer #1 · answered by ♪♥Annie♥♪ 6 · 1⤊ 0⤋
x=0
2007-01-09 05:20:10 · answer #2 · answered by How ya doin? 2 · 1⤊ 0⤋
Because 3x means "three times an unknown variable". What can you multiply three by that will equal the same as just the variable alone? Only 0.
So:
3x in this case is 3 times 0. 3*0 = 0. 0 = 0.
2007-01-09 05:19:22 · answer #3 · answered by Chef Noah 3 · 2⤊ 0⤋
If you substitute any other number in x, the 3x will always be 3 times the x. However, when 0 is multiplied, both sides equal 0.
2007-01-09 17:32:05 · answer #4 · answered by cutest pooky 3 · 0⤊ 0⤋
This starts with the theorem that AB = 0 if and only if A = 0 or B=0 (that's a conjunctive or).
3x-x=0
2x=0
This true only if 2 = 0 or x = 0
2 is never equal to zero, so x must equal 0.
x=0.
QED
2007-01-09 05:18:57 · answer #5 · answered by bequalming 5 · 1⤊ 0⤋
because the 3x in this problem is equal to 3 times 0...
2007-01-09 05:17:57 · answer #6 · answered by heclee 3 · 1⤊ 0⤋
As the only thing that is equal to 3 times itself is 0.
2007-01-09 05:15:59 · answer #7 · answered by The Oracle 2 · 1⤊ 0⤋
Here's two ways to show you why:
1)3x=x
x=0
3(0)=0
0=0
2)3x=x
x=0
Subtract x from both sides:
3x-x=0
2x=0
x=0
Check:
2(0)=0
0=0
I hope this helps!
2007-01-09 07:15:46 · answer #8 · answered by Anonymous · 0⤊ 0⤋
because x=0
2007-01-09 05:19:01 · answer #9 · answered by Anonymous · 1⤊ 1⤋
ifx=0 then 3x=3x0 is 0
2007-01-09 05:23:06 · answer #10 · answered by tuffey 2 · 1⤊ 0⤋