Section_1-6

# Section_1-6 - Section 1-6 Multiplying and Dividing Real...

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Unformatted text preview: Section 1-6 Multiplying and Dividing Real Numbers Objectives Understand multiplying/ dividing by 0, 1, -1 Understand what happens when multiplying/ dividing by negatives Identity property of Multiplication For any real number n, For any real number n, 1 n = n 0n = 0 Multiplication of Zero Multiplication of -1 For any real number n, -1 n = - n Multiplying numbers with the same sign The product of 2 positive numbers or 2 negative numbers is positive 7 8 = (-5)(-12) = (-7)(-8) = Multiplying Numbers with Different Signs The product of a negative number and a positive number is always negative - 39 = 3(-9) = Evaluate the following expressions y = -5 x = -3 2 xy - 3xy EXPONENTS AFFECT ONLY WHAT THEY ARE DIRECTLY TOUCHING!!!!!!!!!!!! -3 4 3 - 4 2 ( - 3) 4 Dividing numbers with the same sign The quotient is always positive - 18 (-6) = 16 4 = Dividing numbers with different signs The quotient is always negative (-18) (6) = 36 (-4) = Evaluate each expression x = -2 y=6 z = 20 4x + y 2 z 3 x y + 20 4 Multiplicative Inverse (fancy pants word for reciprocal) Every real number a has a multiplicative 1 inverse a such that a 1 = 1 a Dividing is the same as multiplying by the 2 3 x=- y= reciprocal. 5 10 y x x y HW # _____ P. 41 (6-12 even) (17-37 odd) (45-51odd) (61 & 73) ...
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