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ra1l [238]
3 years ago
12

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

Mathematics
2 answers:
Serga [27]3 years ago
5 0
Hello,

5i or -5i since there would be at least 4 roots

Answer B and E
Kaylis [27]3 years ago
4 0

Answer:

5i or -5i since there would be at least 4 roots

Answer B and E

Step-by-step explanation:


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=================================================

Explanation:

The vertical sides, when read from left to right, can be divided to get this fraction: 9/90

Following the same order and direction, we divide the slanting corresponding sides to get: b/360

The fractions we constructed are equal to one another, as the triangles are said to be proportional.

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Lets cross multiply and solve for b

--------------------

9/90 = b/360

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--------------------

A quick way to do this may be to notice how the jump from 9 to 90 is "times 10" so the jump from b to 360 is also "times 10". Think in reverse to divide 360 over 10 and we land on 36 as our answer. This line of thinking does not work as simple for all proportional problems.

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