Which is the first incorrect step?

Step 1

Step 2

Step 3

Solution is correct

Step 2

Step 3

Solution is correct

Which is the first incorrect step?

Step 1

Step 2

Step 3

Solution is correct

Step 2

Step 3

Solution is correct

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Sandy Spring, MD

First: Note that |2x - 4| - 3 = 3

What needs to be done to isolate the variable?

Add 3

That gives: |2x - 4| = 6.

There are two answers at this point: +6 and -6.

Therefore: 2x - 4 = 6, 2x = 10, x = 5.

and: 2x - 4 = -6, 2x = -2, x = -1.

But wait ..... were are not done: Check: |2(5)-4| -3 = |10-4| -3 = 6-3 =3, |2(-1)-4| = |-2-4|-3 = 6-3 = 3.

I hope this explains the problem. Remember, each absolute value problem has two answers, at most .

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