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7. (3x - 2)² = 9x² - 12x + 4
=> a = 9
b = -12
c = 4
=> a + b + c = 9 + (-12) + 4
= 1 (A)
8.
=
= (D)
9. 16x² - 36 = (4x - 6) (4x + 6) (A)