47.5k views
3 votes
Solve the inequality.

|3x + 6| < 12


A) –6 < x < 2


B) –21 < x < 3


C) –6 > x > 2


D) –2 < x < 2

User Hunsu
by
6.2k points

2 Answers

3 votes
I think the answer might be A
User Kimbley
by
6.8k points
5 votes

Answer: Be Te Dubs meaning BTW Go To TigerAlgebra.com for questions like yours its really great


Explanation:

|3x+6|<12

One solution was found :

-6 < x < 2

Absolute Value Inequality entered :

|3x+6|<12


Step by step solution :

Step 1 :

Rearrange this Absolute Value Inequality

Absolute value inequalitiy entered

|3x+6| < 12


Step 2 :

Clear the Absolute Value Bars

Clear the absolute-value bars by splitting the equation into its two cases, one for the Positive case and the other for the Negative case.


The Absolute Value term is |3x+6|


For the Negative case we'll use -(3x+6)


For the Positive case we'll use (3x+6)



Step 3 :

Solve the Negative Case

-(3x+6) < 12


Multiply

-3x-6 < 12


Rearrange and Add up

-3x < 18


Divide both sides by 3

-x < 6


Multiply both sides by (-1)

Remember to flip the inequality sign

x > -6

Which is the solution for the Negative Case


Step 4 :

Solve the Positive Case

(3x+6) < 12


Rearrange and Add up

3x < 6


Divide both sides by 3

x < 2


Which is the solution for the Positive Case


Step 5 :

Wrap up the solution

-6 < x < 2


Solution in Interval Notation

(-6,2)


Solution on the Number Line

One solution was found :

-6 < x < 2

User Adam Mlodzinski
by
6.6k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.