WEDNESDAY, SEPTEMBER 21
WARM­UP:
EVALUATE:
­2XY FOR X = ­5 AND Y = ­3
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CORRECT HOMEWORK:
PAGE 34 # 2 ­ 36 (EVENS)
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1­6 MULTIPLYING AND DIVIDING REAL NUMBERS
THE PRODUCT OF A NUMBER AND 1 IS THE ORIGINAL NUMBER.
8(1) =
­12(1)=
9.2(1)=
5
THE PRODUCT OF ­1 AND A NUMBER IS THE OPPOSITE OF THE NUMBER.
6(­1)=
­34(­1)=
9.4(­1)=
6
THE PRODUCT OF A NUMBER AND ZERO IS ZERO.
7(0)= ­5(0)= 2/3(0)=
7
MULTIPLICATION AND DIVISION SIGN RULES
MULTIPLYING OR DIVIDING TWO NUMBERS WITH THE SAME SIGN IS ALWAYS POSITIVE.
MULTIPLYING OR DIVIDING TWO NUMBERS WITH DIFFERENT SIGNS IS ALWAYS NEGATIVE.
8
9
4(­6)=
­4.9(­8)=
­2/3(3/4)=
­10(­5)=
10
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70 (­5)=
­54 (­9)=
­1/2 (3/2)=
­6 (/3/5)=
12
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EVALUATE FOR X=8, Y = ­5, AND Z=­3
1) 3X 2Z + Y 10
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X=8, Y = ­5, AND Z = ­3
2) 2Z + X
2Y
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X=8, Y=­5, AND Z=­3
3) 3Z2 ­4Y X
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EVALUATE FOR X = ­3/4 AND Y = ­5/2
4) X/Y
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X=8 AND Y=­4/5
5) X/Y
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PAGE 41 # 2 ­ 30 (EVENS)
SHOW ALL WORK IN YOUR NOTEBOOK. REMEMBER TO WRITE THE ORIGINAL PROBLEM FIRST!!
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