Question

if x +y =12 and xy =32 then what will x2 +y2?

Answer 1

the right answer is

4^2+8^2

16+64

80

Answer 2

(x+y) ^2=x^2+y^2+2xy

x^2+y^2=(x+y)^2-2xy

=12^2-2×32

144-64

=80

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