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g(x) = x - 3
(fog)(x) = f(g(x)) = 2(x - 3)² = 2(x² - 6x + 9) = 2x² - 12 + 18
(fog)(x) = 2
2x² - 12x + 18 = 2
2x² - 12x + 16 = 0
x² - 6x + 8 = 0
(x - 4)(x - 2) = 0
x = 4 v x = 2
(2x.x-3)(x)=2
(2x²-6x)(x)=2
2x³-6x²=2
-6x³+2x²+2=0