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How do you solve this? |3x+8|=x

User JoeF
by
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1 Answer

3 votes

The solutions are S={2,4}

Step-by-step explanation:

Let's rewrite the equation

|3x−8|−x=0

|3x−8|=3x−8, if 3x−8≥0

and

|3x−8|=−(3x−8)=−3x+8, if 3x−8<0

Let f(x)=|3x−8|−x=0

Let's build a variation table

aaaaxaaaaaaaa−∞aaaaaaaa0aaaaaaaaaa83aaaaaaa+∞

aaaaxaaaaaaaaaaaaa−aaaa#color(white)(aaaaa)+#aaaaaaaa+

aaaa|3x−8|aaaaaa−3x+8a#color(white)(aaa)-3x+8#aaaaa3x−8

aaaaf(x)aaaaaaaaaaax=2a#color(white)(aaaaa)x=2#aaaaaax=4

The solutions are S={2,4}

graph

User Nograpes
by
8.4k points

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