factories 3-2 (a-b) whole square
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9+4(a+b)^2-12(a-b)
9+4a^2+b^2+8ab-12a+12b
9+4a^2+b^2+8ab-12a+12b
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=9- 4[a square -2ab +b square]
=9-[4 a square -8an+4b square]
=(3 ) square - (2a-2b )square
by applying( a square -b square) identity
=[3+2a-2b] [3-2a+2b]
=9-[4 a square -8an+4b square]
=(3 ) square - (2a-2b )square
by applying( a square -b square) identity
=[3+2a-2b] [3-2a+2b]
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