book Maths Puzzle Numerical Ability

directions: graph the equation. label three key points on the graph.

y=2|x-4|-1

thank you

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a/bc + b/ac - c/ab = ? I need help on how to get the answer to this equation: Y=(2x�2 + 4x + 1)�5

and the answer they gave was y= 20(2x +4x +1)�4(x+1), do you think there was a typo somewhere??