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guajiro [1.7K]
3 years ago
15

|3x - 9| = 12 Show all steps please and thank you!

Mathematics
2 answers:
Brums [2.3K]3 years ago
6 0

Answer:

7 & -1

Step-by-step explanation:

Assuming you want the value of x...

Since the equation is wrapped in an absolute value, we must get x for both the positive and negative value.

<u>Positive x</u>

3x-9=12\\3x=21\\x=7

<u>Negative x</u>

3x-9=-12\\3x=-3\\x=-1\\

Both of these will equal 12 when tested.

|3(-1)-9|=12\\|-3-9|=12\\|-12|=12\\12=12\\

|3(7)-9|=12\\|21-9|=12\\12=12\\

bezimeni [28]3 years ago
4 0

Answer:

ayy I gotchuu

Step-by-step explanation:

theres gonna be two solutions

a negative then positive

positive:

|3x - 9| = 12

3x-9=12

3x=21

x=7

negative:

3x-9=-12

3x=-3

x=-1

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DISCLAIMER: I am not a professional tutor or have any professional background in your subject. Please do not copy my work down, as that will only make things harder for you in the long run. Take the time to really understand this, and it'll make future problems easier. I am human, and may make mistakes, despite my best efforts. Again, I possess no professional background in your subject, so anything you do with my help will be your responsibility. Thank you for reading this, and have a wonderful day/night!
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