Solve |2x - 5| = 4. {x | x = -4.5 or x = 4.5} {x | x = 0.5 or x = 4.5} {x | 0.5 < x < 4.5}

{x | x = 0.5 or x = 4.5}

Explanation:

Before we begin, remember that:

The modulus gives the positive value of what's inside it.

This means that:

|a| = |-a| = a

Now, for the given, we have:

|2x-5| = 4

From the above rule, we can deduce that:

either:

2x - 5 = 4

2x = 4 + 5 = 9

x = 4.5 > first solution

Or:

2x - 5 = -4

2x = 5-4 = 1

x = 0.5 > second solution

Now, we check:

at x = 4.5: |2(4.5)-5| = |9-5| = |4| = 4 > first solution verified

at x = 0.5: |2(0.5)-5| = |1-5| = |-4| = 4 > second solution verified

Hope this helps :)

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