which of the following is a polynomial function

[tex]f(x) = 2x { - 10x + 7}^{2} [/tex]
[tex]g(x) = 4x {?}^{2} - 3x + 8[/tex]
[tex]p(x) = x { }^{2} - 7[/tex]
[tex]s(x) = 2 - 1[/tex]


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