(x + 5) (x + 4)
=
x2 + x +
(x + 3) (x - 9)
=
x2 + x +
( 2x + 3 )2
=
x2 + + x
( 2x - 3 )2
=
x2 + + x
( 5x + 8 )2
=
x2 + + x
( 3x - 7 )2
=
x2 + + x
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