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## Answers

(x+y)^2=x^2+y^2+2xy...4^2=x^2+y^2+2*2.....x^2+y^2=16-4.....x^2+y^2=12

(x+y)² = x² + y² + 2xy

(4)² = x² + y² + 2(2)

16 = x² + y² + 4

x² + y² = 16 - 4 = 12

(4)² = x² + y² + 2(2)

16 = x² + y² + 4

x² + y² = 16 - 4 = 12