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b = 3x
a.b = x.3x = 3x^2
(a+3)(b+3) = 3x^2 + 33
a.b + 3.a + 3.b + 9 = 3x^2 + 33
3x^2 + 3.x + 3.3x + 9 = 3x^2 + 33
3x + 9x + 9 = 3x^2 + 33 - 3x^2
12x + 9 = 33
12x = 33 - 9
12x = 24
x = 24/12
x = 2 a = 2
b = 3x = 3.2 = 6 b = 6
2.6 = 12
(2+3)(6+3) = 45
45 - 12 = 33
12 + 33 = 45