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= 20 - 9 + 9
= 20
b. = (-2 + 1) (3 - 3)
= -6 + 6 - 3 + 3
= 0
5(-2)²-3(3)+9 = 5(4) -9 + 9
= 20
(a+1)(b-3) = (-2+1)(3-3) = (-1)(0) = 0
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