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Question

X +Y =9  X*Y = 16 
FIND X^2 + Y ^2


Solution

So,

(x+y)^2 =(9)^2

x^2+y^2+2(xy) = 81
Given that xy=16,so we have,

x^2+y^2+2(16)=81

x^2+y^2+32=81

x^2+y^2=81-32

x^2+y^2=49


Mathematics

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