Answer: -5
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Step-by-step explanation:
Start at -4 on the x axis.
Draw a vertical line until reaching the curve.
Then draw a horizontal line until reaching the y axis.
You should arrive at y = -5. This tells us f(-4) = -5
The input x = -4 leads to the output y = -5
The point (-4, -5) is on the graph. This is the highest point, so it's the vertex of the V shape.
See the diagram below.