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Mathematics
Susie Q
27 May, 07:12
If xy=15 and x+y=5, find x^2+y^2
+5
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1
)
Loosetooth
27 May, 11:11
0
- 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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