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elena-14-01-66 [18.8K]
4 years ago
13

Please help. and please explain the process too

Mathematics
1 answer:
denis-greek [22]4 years ago
6 0
The polynomial as per the given of the problem is f(x)=3x²-21x+30
Find the roots of this polynomial:
 x₁=[-b+√b²-4ac)]/2a and x₂ =[-b-√b²-4ac)]/2a
Plug in : x₁ = [21+√(21²-4(3)(30)]/6 = [21+√81}/6 ; x₁ = 5
and x₂ = [21-√(21²-4(3)(30)]/6 = [21-√81]/6 ; x₂ = 2
 Remark: I don't understand where did you bring √5 , it should be 5
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Answer:

2/14

Step-by-step explanation:

Can divide both the numerator and denominator by two to reduce down to 1/7.

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3 years ago
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iragen [17]

Answer:

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3 years ago
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Sever21 [200]

Answer:

Step-by-step explanation:

(3x + 1)/x = 1/(x -3)                Cross multiply

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L : 1 * - 3 = -3

FOIL: 3x^2 -9x +x - 3

FOIL: 3x^2 - 8x - 3

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3x^2 - 8x -x - 3 = 0             Combine

3x^2 - 9x - 3 = 0                 Factor

It's rather ugly. I had to use the quadratic equation

a = 3

b = - 9

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2 years ago
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HACTEHA [7]

Answer:

8 i think

Step-by-step explanation:

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3 years ago
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