2 years ago

PLZZZZZ HELP NO SPAM ANSWERS AND I WILL GIVE BRAINLIEST

Mathematics

2 answers:

lesya [120]2 years ago

6 0

Answer:

-10.4424

Step-by-step explanation:

i think, you might need to round

krek1111 [17]2 years ago

5 0

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.

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