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(f o g)(x-1) = 3x² - 6x - 3
f(g(x - 1)) = 3x² - 6x - 3
3. g(x-1) - 6 = 3x² - 6x - 3
3. g(x-1) = 3x² - 6x - 3 + 6
3. g(x-1) = 3x² - 6x + 3
= 3.(x² - 2x + 1)
g(x-1) = x² - 2x + 1
g(x-1) = (x - 1)(x - 1)
g (5) = g(6 - 1) = (6 - 1).(6 - 1)
= 5. 5
= 25