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a=5

3a² = 3*5² =3*25=75

(3a)² =(3*5)² =15² =225

3a³=3*5³=3*125=375

a=-5

3a² =  75

(3a)² =225

3a³=-375

a=0.2

3a² = 0.12

(3a)² =0.36

3a³=0.024

a=-0.2

3a² = 0.12

(3a)² =0.36

3a³=-0.024

a=1/3

3a² = 3*1/9 = 1/3

(3a)² =(3*1/3)²=1

3a³=3*1/27=1/9

a=-1/3

3a² = 1/3

(3a)² =1

3a³=-1/9

a=0

3a² = 0

(3a)² =0

3a³=0

a=1/6

3a² =1/12

(3a)² =1/4

3a³=1/72