Tolong kkaa bantu in bentar lagi di kumpul

Tolong kkaa bantu in bentar lagi di kumpul

1.) (4) – (2) + (-20) =

+ 9 – 9

= – 18

2.) (-5) x (-2) x (-3)

-15 + -15

= -30

3.) l8 – xl = 2

8 – x = 2

-x = 2 – 8

-x = -6

x = 6

8 – x = -2

-x = -2 – 8

-x = -10

x = 10

HP = {6, 10}

4). A). |2×-5|=7

2×-5=7

2×=7+5

2×=12

×=6

-2×+5=7

-2×=7-5

-2×=2

×=-1

B). |3x+1|=4x-

a. 3x+1=4x-1

3x-4x= -1-1

-x= -2

x= -2/-1

x=2

3x+1= -(4x-1)

3x+1= -4x+1

3x+4x=1-1

7x=0

x=0/7

x=0

jadi hp {x=2 atau x=0}

5). A). |3x + 4| < 8

-8 < 3x + 4 < 8

*) -8 < 3x + 4

-8 – 4 < 3x

-12 < 3x

-12/3 < x

-4 < x

**) 3x + 4 < 8

3x + 4 < 8

3x < 8 – 4

3x < 4

x < 4/3

HP = {x | -4 < x < 4/3}

B). ( 5- 2x ) > 7

5 – 2x > 7

– 2x > 7 – 5

– 2x > 2

x > -1

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