Question

If the point (8,4) is on the graph of an even function ,what other point must also be on the graph ?

Answer 1

(-8,4) as equal functions are symetrical

Answer 2

A function is "even" when:

f(x) = f(−x) for all x,

Even functions are  symmetry about the y-axis .In other words the point is a reflection about the y axis.

The given point is (8,4) .When a point is reflected along y axis the x changes its value so the point become (-8,4)