Knowee
Questions
Features
Study Tools

If  α, β, γ  are the zeros of the polynomial  x3 − 3x + 11  =  0 , then the polynomial whose zeros are  (α + β), (β + γ)  and  (γ + α)  is -Select an answerA x3 + 3x + 11  =  0 B x3 − 3x + 11  =  0 C x3 + 3x − 11  =  0 D x3 − 3x − 11  =  0

Question

If  α, β, γ  are the zeros of the polynomial  x3 − 3x + 11  =  0 , then the polynomial whose zeros are  (α + β), (β + γ)  and  (γ + α)  is -Select an answerA x3 + 3x + 11  =  0 B x3 − 3x + 11  =  0 C x3 + 3x − 11  =  0 D x3 − 3x − 11  =  0

🧐 Not the exact question you are looking for?Go ask a question

Solution

The sum of the roots of the original polynomial is -b/a = 0 (since there is no x² term), and the sum of the roots of the new polynomial is α+β + β+γ + γ+α = 2(α + β + γ) = 2*0 = 0.

The product of the roots taken two at a time for the original polynomial is c/a = -3, and for the new polynomial it is (α+β)(β+γ) + (β+γ)(γ+α) + (γ+α)(α+β) = 2(αβ + βγ + γα) = 2*-3 = -6.

The product of the roots for the original polynomial is -d/a = -11, and for the new polynomial it is (α+β)(β+γ)(γ+α) = αβγ + α²β + αβ² + β²γ + βγ² + αγ² = αβγ + (α²β + αβ² + β²γ + βγ² + αγ²) = -11 + 3 = -8.

So, the polynomial whose zeros are (α+β), (β+γ) and (γ+α) is x³ - 0x² - 6x - 8 = 0.

None of the options A, B, C, D match this result.

This problem has been solved

Similar Questions

If α,β and γ are the zeroes of the polynomial f(x)=ax3+bx2+cx+d, then 1α+1β+1γ i

If the product of two zeroes of the polynomial f(x) = 2x3 + 6x2 – 4x – 9 is 3, then its third zero isSelect an answerA −32 B +32 C 92 D −92

Given that one of the zeroes of the cubic polynomial ax3 + bx2 + cx + d is one, the product of the other two zeroes isSelect an answerA–c/a         B–d/a     C0Dc/a

If  α, β  and  γ  are the zeros of the polynomial  2x3 − 6x2 − 4x + 30 . then the value of  (αβ + βγ + γα)  isSelect an answerA–2B2C5D–30

Factor this polynomial completely.10x2 – 11x + 3A.(2x – 1)(5x – 3)B.(5x – 3)(x – 1)C.(5x – 1)(x – 3)D.(2x – 3)(5x – 1)

1/3

Upgrade your grade with Knowee

Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.