If x = 2 + √5 and y = 2 - √5, find the value of x2 + y2.

A

10

B

15

C

18

D

8√5

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Solution:
দেওয়া আছে,
x = 2 + √5
y = 2 - √5

∴ x + y = (2 + √5) + (2 - √5) = 4

এবং
xy = (2 + √5)(2 - √5)
= 22 - (√5)2
= 4 - 5
= - 1

এখন,
x2 + y2
= (x + y)2 - 2xy
= (4)2 - 2(- 1)
= 16 + 2
= 18

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Updated: 15 hours ago

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