Question

Subtract (x2 + y2 – 2xy) from (x2 + y2 + 2xy)

Answer 1

===> ( x² + y² - 2xy ) - ( x² + y² - 2xy )

=> ( x² + y² - 2xy ) + x² - y² +2 xy {sign of Subtract will change the other signs that are in bracket if opened}

=> x² + y² - 2xy + x² - y² +2xy

=> x² + x² + y² - y² + 2xy - 2xy (check the signs)

= 2x² ans

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