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### Grade 8 - Mathematics7.38 Problems - II

 Example: If x-y = 3 and xy = 10, find the value of x2+y2. Solution: Given that, x-y = 3 Squaring on both sides, we get (x-y)2 = 32 x2+y2-2xy = 9 x2+y2-2.10 = 9 (Since xy = 10) x2+y2-20 = 9 x2+y2 = 9+20 x2+y2 = 29. Directions: Solve the following problems. Also write at least ten examples of your own.
 Q 1: If x-y = 3 and xy = 40, find the value of x2+y2.79596989 Q 2: If x-y = 6 and xy = 91, find the value of x2+y2.158198218238 Q 3: If x-y = 6 and xy = 16, find the value of x2+y2.78684858 Q 4: If x-y = 4 and xy = 21, find the value of x2+y2.68675857 Q 5: If x-y = 3 and xy = 18, find the value of x2+y2.35452555 Q 6: If x-y = 10 and xy = 75, find the value of x2+y2.200150250300 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!