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13 votes
13 votes
3+7=6-|-x|
Solve for x.
Thanks :)


User Psfinaki
by
2.9k points

2 Answers

28 votes
28 votes

Answer:

no solution

Explanation:

| | is a notation for absolute value, which is the distance that a number is from 0.

you can think of this as the "positive version" of a number

so, |-x| will become: x

We can plug this into the equation, and solve like we would for any variable

3 + 7 = 6 - |-x| {simplify}

3 + 7 = 6 - x {simplify}

10 = 6 - x

Now, we can isolate x (isolate = get it alone)

10 = 6 - x

-6 - 6 {subtract 6 from both sides}

4 = -x {multiply both sides by -1 to get positive x}

·-1 ·-1

- 4 = x

{check solution:}

3 + 7 = 6 - | -4 |

10 = 6 - 4

10 = 2

FALSE

because this solution has been found to be false, there is no possible value for x

we write this as: no solution

User Ashutosh Soni
by
3.2k points
16 votes
16 votes


3+7=6-|-x|\\10=6-|x|\\|x|=-4\\x\in\emptyset

User Rafaela
by
2.9k points