Question 1059381
f(x) = 4x^3 +11x^2 -115 = 28, and k = 4 is a zero
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where is k in f(x)?
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Let's check x = 4 is a zero of f(x)
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rewrite f(x)
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4x^3 +11x^2 -115 -28 = 0
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4x^3 +11x^2 -143 = 0
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If we substitute x=4, we should get 0
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4(4^3) +11(4^2) - 143 = 0
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256 +176 -143 = 0
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432 -143 = 0
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289 does not = 0
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x = 4, is not a zero of f(x)
Do you have f(x) correctly stated?
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