3 years ago

If xy=15 and x+y=5, find x^2+y^2

Mathematics

1 answer:

lora16 [44]3 years ago

8 0

Answer:

- 5

Step-by-step explanation:

Note that

(x + y)² = x² + 2xy + y², thus

x² + y² = (x + y)² - 2xy ← substitute given values

= 5² - 2(15)

= 25 - 30

= - 5

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