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SQUARE OF POLYNOMIAL.

(x-y+3)^2 =

(x+y-3)^2=

(x-y-3)^2=

(x+y+3)^2=

Please answer this question because I need it now.. This is my homework in Math Thanks!!!

Sagot :

(x-y+3)² = (x-y+3)(x-y+3)
            = x² - xy + 3x - xy + y² - 3y + 3x - 3y + 9
            = x² + 6x - 2xy - 6y + y² + 9
(x+y-3)² = (x+y-3)(x+y-3)
            = x² + xy - 3x + xy + y² - 3y - 3x - 3y + 9
            = x² - 6x + 2xy - 6y + y² + 9
(x-y-3)² = (x-y-3)(x-y-3)
           = x² - xy - 3x -xy + y² + 3y - 3x + 3y + 9
           = x² - 6x - 2xy + 6y + y² + 9
(x+y+3)² =(x+y+3)(x+y+3)
             = x² + xy + 3x + xy + y² + 3y + 3x + 3y + 9
              = x² + 6x + 2xy + 6y + y² + 9