Question

If 2+√(5) / 2-√(5) =x and 2-√(5) /2+√(5) =y, find the value of x² - y²​

Answer 1

For answer refer to attachment :

Some formulae :

• (a+b)(a-b) = a² - b².
• (a+b)² = a² + b² + 2ab.
• (a-b)² = a² + b² -2ab.
• (a+b)³ = a³+b³+3ab(a+b).
• (a-b)³ = a³ - b³ -3ab(a-b).
• (a+b+c)² = a²+b²+c²+2(ab+bc+ca)

Answer 2

Answer:

i dont know answer difficult