Question

a)-[x-{y+(y-x)-(x-y)-x}-y]​

Answer 1

- ( x - ( y + ( y - x ) - ( x - y ) - x ) y)

- ( x - ( y + y - x - x + y - x ) y )

- ( x ( - y - y + x + x - y + x ) y

- ( x - y² - y² + xy + xy - y² + xy )

- x + y² + y² - xy - xy + y² - xy

- x + 3y² - 3xy

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