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faust18 [17]
2 years ago
5

Which of the following represents the set of possible rational roots for the

Mathematics
2 answers:
yawa3891 [41]2 years ago
7 0
<h3>Answer: Choice D</h3>

The plus/minus of the following: 1/2, 1, 2, 5/2, 4, 5, 10, 20

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

Explanation:

Refer to the rational root theorem. To find the possible rational roots, we divide the factors of the last term 20 over the factors of the first coefficient 2.

  • Factors of 20 are: 1,2,4,5,10,20
  • Factors of 2 are: 1,2

Dividing those said factors leads us to the list in choice D. We include the positive and negative versions of each result. For example, divide 10 over 2 to get 10/2 = 5 as one possible root (which leads to -5 as well).

A table like the one shown below might be handy to keep track of all the terms.

Sholpan [36]2 years ago
3 0

Answer:

  • D

Step-by-step explanation:

<u>Simplify the given equation by dividing all terms by 2:</u>

  • x³ + 2.5x² - 4x - 10 = 0
  • x²(x + 2.5) - 4(x + 2.5) = 0
  • (x + 2.5)(x² - 4) = 0
  • (x + 2.5)(x + 2)(x -2) = 0

<u>Roots are:</u>

  • - 2.5, -2, 2

Correct choice is D

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