Question

If (x-y) =10 and xy=9, find the value of x square + y square

Answer 1

If (x-y) =10 and xy=9, find the value of x square + y square. = 512.5

Answer 2

Square the both sides of (x-y)=10
(x-y)²=(10)²
x²+y²-2xy=100
x²+y²-2*9=100
x²+y²-18=100
x²+y²=100+18
x²+y²=118

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