Which represents a quadratic function?
f (x) = - 8x3 - 16x2 - 4x
f (x) = three-quarters x 2 + 2x - 5
f (x) = StartFraction 4 Over x squared EndFraction minus StartFraction 2 Over x EndFraction + 1
f (x) = 0x2 - 9x + 7
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