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Nonlinear Functions

SAT Math· difficulty 4/5

Which polynomial function is even?

  • A

    f(x)=x4+xf(x) = x^4 + x

  • B

    f(x)=3x4−2x3+7f(x) = 3x^4 - 2x^3 + 7

  • C

    f(x)=3x4−2x2+7f(x) = 3x^4 - 2x^2 + 7

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  • D

    f(x)=x5−xf(x) = x^5 - x

Explanation

A polynomial is even when all terms have even powers of xx (constant counts as x0x^0).

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