The graph of y=f(x) has the line x=5 as an axis of symmetry. The graph also passes through the point (8,-7) Find another point that must lie on the graph of y=f(x)
+2 Have a look at the solution here. Hope it helps.
https://www.varsitytutors.com/hotmath/hotmath_help/topics/axis-of-symmetry-of-a-parabola
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