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a. (x + 3) (x - 5) = 0
x + 3 = 0
x1 = - 3
x - 5 = 0
x2 = 5
S = {- 3, 5}
b. 3x (2x + 9) (x - 7) = 0
3x = 0
x1 = 0
2x + 9 =0
2x = - 9
x2 = - 9/2
x - 7 = 0
x3 = 7
S = {- 9/2, 0, 7}