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39 votes
39 votes
Solve for |3x+9|=30

X=7
X = 1, -19
no solution
x = 7,-13

User MarkDBlackwell
by
2.9k points

1 Answer

16 votes
16 votes

Answer:

x = 7

Hope this helps :)

Explanation and Check part below.

Explanation:

1. Isolate variable by doing the inverse operation which is in this case subtracting 9 on both sides of the equation.

3x + 9 = 30

- 9 - 9

3x = 21

2. Divide both sides of the equation by 3 since this is the inverse operation.

3x = 21

--- ---- <-------- fraction bar, divide

3 3

x = 7

Check:

3(7) + 9 = 30

21 + 9 = 30

30 = 30 ✓

User Deighton
by
2.9k points