Question

PLZZZZZ HELP NO SPAM ANSWERS AND I WILL GIVE BRAINLIEST

Answer 1

Answer:

-10.4424

Step-by-step explanation:

i think, you might need to round

Answer 2

Answer:

Given:- x = 3 + √5 ; y = 3 - √5

Expression:- x² - 2xy + y²

• (3 + √5)² - 2 × 3 + √5 × 3 - √5 + (3 - √5)²
• 9 + 5 + 6√5 - 2 × (3² - √5²) + 9 + 5 - 6√5
• 14 + 6√5 - 2 × (9 - 5) + 14 - 6√5
• 28 - 2 × 4
• 28 - 8
• 20

Hence, Value of expression x² - 2xy + y² is 20.