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Tresset [83]
3 years ago
15

Two roots of a 3-degree polynomial equation are 5 and -5. Which of the following cannot be the third root of the equation? 0 -5i

-5 5i 5
Mathematics
1 answer:
sammy [17]3 years ago
5 0

Answer:

-5i and 5i cannot be roots of the equation, since they are complex.

Step-by-step explanation:

A 3-degree polynomial equation must have 3 roots, if one of its roots is a complex number, then its conjugate must also be a root of the function. The problem already stated two roots, which are reals, therefore the last root must also be real. Using this line of thought we know that -5i and 5i cannot be roots of the equation, since they're complex.

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kati45 [8]
The question does not make sense.
The commutative property applies to addition and multiplication, not addition and subtraction.
The commutative property does not apply to subtraction or division because in those operations, the order of the numbers makes a difference, whereas in addition and subtraction the order does not make a difference.

For example:

Addition
5 + 4 = 9
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Changing the order of the 4 and the 5 gives the same answer.
The commutative property does apply to addition.

Multiplication 
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Changing the order of the 4 and the 5 gives the same answer.
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Changing the order of the 4 and the 5 gives a different answer.
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Division
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8 0
3 years ago
Read 2 more answers
Write your question here (Keep it simple and clear to get the best answer)4x³-5x is it odd or even function
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Answer:

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Step-by-step explanation:

To determine if odd/ even

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Since f(- x) = - f(x) , then 4x³ - 5x is odd

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3 years ago
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4 years ago
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kirill115 [55]

Step-by-step explanation:

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x=4.

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