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= 2(x - 3y)(x - 3y)
b.) 36a² - 16b² = 4(9a² - 4b²)
= 4(3a - 2b)(3a - 2b)
c.) x² + 5x + 6 = (x + 2)(x + 5)
d.) 6x² - 19x + 15 = (6x² - 9x) + (-10x + 15)
= 3x(2x - 3) -5(2x - 3)
= (3x - 5)(2x - 3)
e.) 15 - 7x - 2x² = (5 + x)(3 - 2x)
f .) 12y² - 8y + 1 = (12y² - 6y) + (-2y + 1)
= 6y(2y - 1) - 1(2y - 1)
= (6y - 1)(2y - 1)