remember
if you have |a|=b
solve for a=b and a=-b
1. | 2x |=4
assume 2x=4 and 2x=-4
divide by 2
x=2 and -2
2. | x-3 |=7
assume x-3=7 and - 7
add 3 to both sides of each equation
x=10 and -4
3. | 2x+5 |=21
assume 2x+5=21 and 2x+5=-21
minus 5 both sides
2x=16 and 2x=-26
divide by 2
x=8 and x=-13
4. 3 |x+4|= 24
divide both sides by 3
|x+4|=8
assume that x+4=8 and x+4=-8
minus 4 both sides
x=4 and x=-12
5. | x+2 | = 2x+4
assume
x+2=2x+4 and x+2=-(2x+4)=-2x-4
minus 2 both sides
x=2x+4 and x=-2x-6
first one, minus 2x both sides and multiply by -1
2nd one, add 2x to both sides and divide by 3
x=-4 and -2
6.| x+7 |=0
x+7=0
minus 7
x=-7
7. 2 | x+1 | - 3 =17
add 3 to both sides
2|x+1|=20
divide both sides by 2
|x+1|=10
assume
x+1=10 and x+1=-10
minus 1 both sides
x=9 and -11
1. x=-2 and x=2
2. x=-4 and x=10
3. x=-13 and x=8
4. x=-12 and x=4
5. x=-4 and -2
6. x=-7
7. x=-11 and x=9
