01:640:111 Lecture Notes - Lecture 3: Set Notation, Negative Number
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30 Dec 2019
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Example: x3 1 2 x a + b 0 (can be any. , so we multiply both sides by the reciprocal of a or divide by a. if a<0, you need to flip the inequality. The solution is a set of numbers and has to be in set notation. olution. X y x + a y + a a a. Y x y = 2. Z x z and x and x and x and y a > 0 a < 0 t x > 0 x y. When you divide by a negative number, you flip the sign the opposite direction. 3 2 3 < 2 2 + 4. 3 2 2 2 3 4 > 0 x x2 3 4 > 0 x ( 4 x 4 = 0 + 1 = 0 x = 4 = 1.
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