Question

if x-y = 7. finf x^2 +y^2 given xy=9​

Answer 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