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melisa1 [442]
3 years ago
15

Helppp more points 20 math

Mathematics
1 answer:
Serjik [45]3 years ago
7 0

Answer:

root(250)

answer choice C

Step-by-step explanation:

explanation in the pic above.

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If a polynomial function f(x) has roots -8, 1, and 6i, what must also be a root of f(x)?
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Answer:

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Step-by-step explanation:

If a polynomial is expressed with real coefficients (which must be the case if it is a function f(x) in the Real coordinate system), then if it has a complex root "a+bi", it must also have for root the conjugate of that complex root.

This is because in order to render a polynomial with Real coefficients, the binomial factor  (x - (a+bi)) originated using the complex root would be able to eliminate the imaginary unit, only when multiplied by the binomial factor generated by its conjugate: (x - (a-bi)). This is shown below:

(x-(a+bi))*(x-(a-bi))=\\(x-a-bi)*(x-a+bi)=\\([x-a]-bi)*([x-a]+bi)=\\(x-a)^2-(bi)^2=\\(x-a)^2-b^2(-1)=\\(x-a)^2+b^2

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Then, the conjugate of this root would be: +6i, giving us the other complex root that also may be present in the real polynomial we are dealing with.

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3 years ago
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Answer:

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The increase is the <em>difference</em> between the 2009 price and the 2008 price.

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