(x + 1) (x + 8)
=
x2 + x +
(x + 9) (x + 3)
=
x2 + x +
(x + 4) (x - 8)
=
x2 + x +
(x + 1) (x - 8)
=
x2 + x +
( 3x + 4 )2
=
x2 + + x
( x - 8 )2
=
x2 + + x
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