Find a 4th degree polynomial function with real coefficients satisfying the given conditions. n = 4; 21, 7, and -7 are zeros;

Question

Find a 4th degree polynomial function with real coefficients satisfying the given conditions.
n = 4; 21, 7, and -7 are zeros; leading coefficient is 1
f(x)=x^4-45x^2-196
f(x) = x^4 + 4x^3-45x²-196
f(x) = x^4 + 4x^2-7x - 196
f(x) = x^4 + 4x²-196

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