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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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