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4x - 4x + 18x - 18
2x(2x - 2) + 9(2x - 2)
(2x + 9)(2x - 2)
p x q = -18 x 4 = -72
p + q = 14
p = -4 , q = 18
maka 4x² + 14x - 18 = 4x² - 4x + 18x -18
= (4x² -4x)+(18x - 18)
=4x(x - 1) +18(x -1)
=(x - 1) (4x + 18)