A tracking device that is installed in a mobile phone indicates that its user is located at a point whose coordinates are (18,14). In the tracking device, each unit on the grid is equivalent to 7 km. If the phone user came from a place whose coordinates are (2,6)? How far has he travelled?

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.