Sketch the curves with the following equations:
a. y = (x + 1)2(x – 1) 

b. y = (x + 2)(x – 1)² 

c. y = (2 – x)(x + 1)²

d. y = (x – 2)(x + 1)² 

e. y = x²(x + 2) 

f. y = (x – 1)2x

g. y = (1 – x)²(3 + x) 

h. y = (x – 1)²(3 – x) 

i. y = x²(2 – x)

j. y = x²(x – 2)