if x-y = 7. finf x^2 +y^2 given xy=9
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Answered by
1
Answer:
67
Step-by-step explanation:
Given , x-y = 7 and xy =9
Also we know that, (x-y)² = x² + y² - 2xy
by substituting values ,
ie, 7² = x² + y² - 2 x 9
ie, 49 = x² + y² - 18
ie, x² + y² = 49 + 18
= 67
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