Question 851907
The x coordinate of the vertex occurs where the argument of the absolute value equals zero.
{{{3x+2=0}}}
{{{3x=-2}}}
{{{x=-2/3}}}
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(-2/3,-4)
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{{{drawing(300,300,-5,5,-5,5,grid(1),circle(-2/3,-4,0.2),graph(300,300,-5,5,-5,5,abs(3x+2)-4))}}}