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CaHeK987 [17]
3 years ago
13

PLZZZZZ HELP NO SPAM ANSWERS AND I WILL GIVE BRAINLIEST

Mathematics
2 answers:
lesya [120]3 years ago
6 0

Answer:

-10.4424

Step-by-step explanation:

i think, you might need to round

krek1111 [17]3 years ago
5 0

Answer:

<u>Given</u>:- x = 3 + √5 ; y = 3 - √5

<u>Expression</u>:- 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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(a)

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