degree 3: zeros: 9, -8 -i

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The remaining zero is i

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the question say

information is given about a polynomial f(x) whose coefficient are real numbers. find the remaining zeros of f

degree3; zeros: 9, -8 -i

ok thank you

f(x)= x^5 - x^4 + 5x^3 - 2x^2 -12x +5; [1.3, 1.6]

f(1.3)=

f(1.6)=

can you please help me with this problem and how it is worked out as well

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