Producto de Sumas 2

Expand the following products

(x + 1) (x - 7) = x2 + x +
(x + 3) (x - 7) = x2 + x +
(x + 2) (x - 2) = x2 + x +
(x + 4) (x - 9) = x2 + x +
(x + 1) (x - 4) = x2 + x +
(x + 9) (x - 7) = x2 + x +
(x + 4) (x - 7) = x2 + x +
(x + 5) (x - 9) = x2 + x +

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