Question

Which is incorrect Identity:

(x²-y²)=x²-2xy+y²

(x²-y²)=(x-y) (x+y)

x²+y²-2xy=(x-y)²

(x+y)²=x²+2xy+y²

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Answer 1

Answer:

Answer: (x + y)² = x² + 2xy + y² ... it's the seecond as the perfect square rule: (x+y)^2=(x +y)(x+y)=x^2+xy+xy+y^2=(x*x)+(x*y)+(y*x)+(y* y).

Answer 2

Answer:

(x²-y²)=x²-2xy+y²

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