( a + 2 )2 =
a^2 + 4a + 4
( x + 3 )2 =
x^2 + 6x + 9
( a - x )2 =
a^2 - 2x- 1
( x - 2 )2 =
x^2 - 4x - 4
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( a + 2 )2 =
a^2 + 4a + 4
( x + 3 )2 =
x^2 + 6x + 9
( a - x )2 =
a^2 - 2x- 1
( x - 2 )2 =
x^2 - 4x - 4