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b. (3x + 5)(2x - 1) = 6x² - 3x + 10x - 5 = 6x² + 7x - 1
3x - 2x = -1 -5
x = -6
A = 3x + 5
= 3 × -6 + 5
= -18+ 5 = -13
B = 2x - 1
= 2 × -6 -1
= -12 -1 = -13
a.) 2A - B⇒ 2 x -13 - (-13)⇒ -26 + 13 = -13
b.) A x B ⇒ -13 x -13 = -169