9(x + y)^2 - 12(x + y)(x +y) + 4(x + y)^2
multiplicando parte literal del coeficiente 12 queda
= 9(x + y)^2 - 12(x + y)^2 + 4(x + y)^2
tomando factor común (x + y)^2
= (x + y)^2 (9 - 12 + 4)
= (x + y)^2 resultado final
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9(x + y)^2 - 12(x + y)(x +y) + 4(x + y)^2
multiplicando parte literal del coeficiente 12 queda
= 9(x + y)^2 - 12(x + y)^2 + 4(x + y)^2
tomando factor común (x + y)^2
= (x + y)^2 (9 - 12 + 4)
= (x + y)^2 resultado final