Which of the following is a quadratic function? f(x) = 2^x f(x) = 1-8x^2 f(x) = 6x+3 f(x) = 0x^2+9x-12

Which of the following is a quadratic function?

f(x) = 2^x
f(x) = 1-8x^2
f(x) = 6x+3
f(x) = 0x^2+9x-12


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