The graph of which function is decreasing over the interval open paren negative 4 comma infinity close paren ?

A downward-opening parabola decreases to the right of its vertex. Choice D, f(x) = −(x + 4)² + 4, has its vertex at x = −4 and opens downward, so it is decreasing for every x greater than −4. Choice B also opens downward, but its vertex is at x = 4, so it increases between −4 and 4.

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