Which graph represents an even function?

Step-by-step explanation:

The first graph (the parabola opening down) represents an even function, since this graph is symmetric with respect to the y-axis.

Step-by-step explanation:

For an even function we have f(x) = f(-x)

In the given graphs let us substitute values

In first graph

            f(2) = 0

            f(-2) = 0

            So f(2) = f (-2)

            Graph is even

In second graph

            f(2) = 0

            f(-2) = 4

            So f(2) ≠ f (-2)

            Graph is not even

First graph represents an even function

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step-by-step explanation: