11-01-2020
Mathematics

contestada

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

Respuesta :

jimrgrant1 jimrgrant1

11-01-2020

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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