Answer:
x² + y² = 30
Step-by-step explanation:
Given: xy = 20
(x+y)² = 70
Solution:
=> x² + 2xy + y² = 70 [(a+b)² = a²+2ab+b²]
=> x² + 2(20) + y² = 70
=> x² + 40 + y² = 70
=> x² + y² = 70 - 40
=> x² + y² = 30
x²+y² = 30
option no. ( c )
I hope it helps you
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Answers & Comments
Answer:
x² + y² = 30
Step-by-step explanation:
Given: xy = 20
(x+y)² = 70
Solution:
(x+y)² = 70
=> x² + 2xy + y² = 70 [(a+b)² = a²+2ab+b²]
=> x² + 2(20) + y² = 70
=> x² + 40 + y² = 70
=> x² + y² = 70 - 40
=> x² + y² = 30
Verified answer
Answer:
x²+y² = 30
option no. ( c )
I hope it helps you