Question: Show that the triangle whose vertices are Upper P left parenthesis 1 comma negative 1 right parenthesisP(1,1), Upper Q left parenthesis negative 7 comma negative

Show that the triangle whose vertices are

Upper P left parenthesis 1 comma negative 1 right parenthesisP(1,1),

Upper Q left parenthesis negative 7 comma negative 1 right parenthesisQ(7,1),

and

Upper R left parenthesis negative 3 comma negative 9 right parenthesisR(3,9)

is isosceles.

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