Question

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Answer 1

Answer:

Alpha = α

Beta = β

We recall that for a quadratic equation in the form 

y = ax² + bx + c 

The sum and product of the roots can be determined as such: 

y = x^2 - (sum)x + (product) 

The numerical coefficient of x² must be 1. 

Applying this on the given function, 

5y² - 7y + 1 

(1/5) (y² - (7/5)y + 1/5) 

Therefore, sum of the roots (α + β) and product of the roots (αβ), respectively, are: 

α + β = 7/5 

αβ = 1/5 

Now, we are asked to find a polynomial with roots 2α/β and 2β/α. What we'll do is get their sum and product: 

Product: 

2α/β × 2β/α 

4αβ / αβ 

= 4 

Sum: 

2α/β + 2β/α 

(2α² + 2β²) / αβ

2(α² + β²) / αβ 

Complete the square inside the parenthesis by adding 2ab, but at the same time subtracting 2(2ab) outside the parenthesis to counter its effect: 

[ 2(α² + 2αβ + b^2) - 4αβ ] / αβ]

[ 2(α + β)² - 4αβ ] / αβ]

note that, we have values for α + β and αβ from above. 

[ 2(7/5)² - 4(1/5) ] / (1/5)]

= 78/5 

Therefore, the polynomial is, 

y² - (sum)y + (product) 

y² - (78/5)y + 4 

Step-by-step explanation: