Math, asked by daris52, 19 days ago

To help a poor student, ariv donated α pens and β books to him, where α and β represent the zeroes of polynomial x^2-5x + 4. inspired by the deed of ariv,arya also donated 2α+ 3β pens and 3α + 2β books to that student. find a polynomial whose zeroes are the number of pens and books donated by arya. explain why arya got inspired by the deed of ariv.​

Answers

Answered by hukam0685
0

Step-by-step explanation:

Given:To help a poor student, ariv donated α pens and β books to him, where α and β represent the zeroes of polynomial x²-5x + 4. inspired by the deed of ariv,arya also donated 2α+ 3β pens and 3α + 2β books to that student.

To find: find a polynomial whose zeroes are the number of pens and books donated by arya. explain why arya got inspired by the deed of ariv.

Solution:

As \alpha and \beta are zeros of x^2-5x+4

So,According to relation of zeros and coefficient of quadratic polynomial

 \alpha +   \beta = 5...eq1 \\  \\   \alpha  \beta  = 4...eq2 \quad

ATQ,

Arya donated 2\alpha+3\beta pens

and 3\alpha+2\beta books.

let

\bold{m=2\alpha+3\beta}

\bold{n=3\alpha+2\beta}

Quadratic polynomial with zeros m and n is given by

 {x}^{2}  - (m + n)x + mn \\

Find Value of m+n:

m + n = 2 \alpha  + 3 \beta  + 3 \alpha  + 2 \beta  \\  \\ m + n = 5 \alpha  + 5 \beta  \\  \\ m + n = 5 (\alpha  + \beta)  \\  \\

put value from eq1

m + n = 5 \times 5 \\  \\ m + n = 25...eq3 \\  \\

Find mn:

mn = (2 \alpha  + 3 \beta )(3 \alpha  + 2 \beta ) \\  \\ mn = 6 { \alpha }^{2}  + 4 \alpha  \beta  + 9 \alpha  \beta  + 6 { \beta }^{2}  \\  \\ mn = 6( { \alpha }^{2}  +  { \beta }^{2} ) + 13 \alpha  \beta...eq4  \\  \\

find value of  { \alpha }^{2}  +  { \beta }^{2}

Square eq1 both sides

( { \alpha +   \beta })^{2}  = 25 \\  \\ open \: identity \\  \\  { \alpha }^{2}  +  { \beta }^{2}  + 2 \alpha  \beta  = 25 \\  \\  { \alpha }^{2}  + { \beta }^{2}  = 25 - 2 \alpha  \beta  \\  \\ { \alpha }^{2}  +  { \beta }^{2}  = 25 - 2 \times 4 \\  \\ { \alpha }^{2}  +  { \beta }^{2}  = 25 - 8 \\  \\ { \alpha }^{2}  +  { \beta }^{2}  = 17 \\  \\

put value of  { \alpha }^{2}  +  { \beta }^{2} in eq4

mn = 6 \times 17+13(4)  \\  \\ mn = 102+52 \\  \\ mn = 154 \\  \\

Therefore, quadratic polynomial is

 {x}^{2}  - 25x + 154 \\  \\

Final answer:

The quadratic polynomial is

 \bold{\red{{x}^{2}  - 25x + 154}} \\  \\

Arya got inspired by the deed of ariv because helping poor students is a good behavior.

Hope it helps you.

To learn more on brainly:

1) Quadratic polynomial 2x²-3x+1 has zeros as alpha and beta now form a quadratic polynomial whose zeroes are 3alpha and 3b...

https://brainly.in/question/4403481

2)If x + 2a is a factory of x5 - 4a2 + 2x + 2a +3, find a

https://brainly.in/question/42054652

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