(x + 9) (x + 6) = x2 + x +
(x + 7) (x + 2) = x2 + x +
(x + 9) (x + 9) = x2 + x +
(x + 1) (x - 7) = x2 + x +
( x - 8 )2 = x2 + + x
( 2x + 7 )2 = x2 + + x

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