What is the sum of the roots of the polynomial shown below f(x)=x^3-4x^2-11x+30

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asked Apr 13, 2019 56.4k views

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Robert Ilbrink · Answer 1 · 2019-04-19T07:43:45+0000

The sum of the roots of a cubic is the opposite of the coefficient of the squared term (provided that the leading coefficient is 1).

The sum of the roots is -(-4) = 4.

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The graph shows the roots to be -3, 2, 5, whose sum is 4.

What is the sum of the roots of the polynomial shown below f(x)=x^3-4x^2-11x+30-example-1

What is the sum of the roots of the polynomial shown below f(x)=x^3-4x^2-11x+30

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