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1) xy + zx + 4x
= ( + + )
2) 2 (x – y) – (x – y)x
= ( – )( – )
3) 7x – 14xy + 21x^{2}
= ( – + )
4) x (x +2) – 3(x +2)
= ( + )( – )
5) (4x – 2)4x – (4x – 2)2
= ( – )( – )
6) 6x^{4} – 4x^{3} + 12x^{2}
x2( x2 – + )
7) (1 – x) – x (1 – x)
= ( – ) ( – )
8) 56x – 21x^{2}
= 7x ( – )
9) ax^{2}y – 2ax^{2}z
= x2 ( – )
10) ayx + yx^{3} – 2y^{2}x^{2}
= ( +x2 – )