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3. 4×^2 -16 = (2× + 4)(2×-4)
2. 4×^2 -16× = 4×(×-4)
4. 3×^2y - 6xy^2= 3xy ( x- 2y)
5.×^2 - 9 y^2 = (×+3y)(×-3y)
6. 18a^2 + 8b^2 = 2(9a^2+ 4b^2)
7. (1/2)ax^2 + 1/4 a^2x = 1/4 ax (1/4x + a)
8. 1/4 x^2 - 1/36 y^2 = 1/4 ( x^2 - 1/9 y^2)