Answered

The polynomial equation x3+x2=-9x-9 has complex roots +-3i . What is the other root? Use a graphing calculator and a system of equations.

–9

–1

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1

Verified Answer :

taskmasters

If the equation has roots of +-3i. The equation would be,
                                (x + 3i)(x - 3i) 
which is equal to x^2 - (3i)^2 = x^2 + 3. 
Using division either by synthetic or long method,
                                (x^3 + x^2 + 9x + 9)/(x^2 + 3) 
is equal to,
                                        x + 1 or x = -1
Thus, the answer is the second choice.

Answer:

It's B. on EtDtGte

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