Question

Find the value of (x^2 + y^2) if x+y=10 and xy=15​

Answer 1

Step-by-step explanation:

x + y = 10

xy = 15

(x + y)² = 10²

x² + 2xy + y² = 100

x²+ 2×15 + y² = 100

x²+ 30 + y² =100

x² + y² = 100-30

∴x² + y² = 70

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