1. x2= 16

√x2= √16

x= + or - 4

2. f2= 81

√f2=√81

f= + or -9

3. r2 - 100= 0

r2= 100

√r2=√100

r= + or -10

4. x2 - 144= 0

x2= 144

√x2=√144

x= + or -12

5. 2s2= 50

2s2÷2= 50÷2

s2= 25

√s2=√25

s= + or -5

6. 4x2- 225= 0

4x2= 225

4x2÷4= 225÷4

x2=56.25

√x2=√56.25

x= + or - 7.5

7. 3h2 - 147= 0

3h2= 147

3h2÷3=147÷3

h2=58.33

√h2=√58.33

h= + or - 7.64

8. (x-4)2=169

x2-8x+16=169

x2-8x=169-16

x2-8x-153=0

a=1

b=-8

c=-153

x= -b + or -√b2-4ac / 2a

x= -(-8)+ or -√(-8)2-4(1)(-153) / 2(1)

x= 8 + or -√64+612 /2

x= 8 + or -√676 / 2

x= 8 + or -26 /2

x= 8 + or -13

xsub1=8+13= 21

xsub2=8-13= -5

9. (k+7)2= 289

k2+14k+49=289

k2+14k=289-49

k2+14k-240=0

a=1

b=14

c=-240

x= -b + or -√b2-4ac /2a

x= -(14) +or -√(14)2-4(1)(-240) /2(1)

x= -14 + or -√196+960 /2

x=-14 + or -√1156 /2

x=-14 + or 34/2

x=-14 + or 17

xsub1=-14+17= 3

xsub2=-14-17 =-31

10. (2s-1)2=225

4s2-4s+1=225

4s2-4s=225-1

4s2-4s-224=0

a=4

b=-4

c=-224

x=-b + or -√b2-4ac /2a

x=-(-4)+ or-√(-4)2-4(4)(-224) /2(4)

x= 4 + or -√16+3584 /8

x= 4 + or -√3600 /8

x= 4 + or -60/8

x= 4 + or -7.5

xsub1= 4 +(-7.5) = -3.5

xsub2= 4 + 7.5 = 11.5