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g(f(x)) = x² + 3x - 11
g(x² + 3x - 5) = x² + 3x - 11
misal: x² + 3x - 5 = a
x² + 3x - 5 - 6 = a - 6
x² + 3x - 11 = a - 6
g(a) = a - 6
g(x) = x - 6
b) (gof)(x) = 3x² - 6x + 7
g(f(x)) = 3x² - 6x + 7
g(x² - 2x + 1) = 3x² - 6x + 7
misal: x² - 2x + 1 = m -- kedua ruas dikali 3
3x² - 6x + 2 = 2m
3x² - 6x + 2 + 5 = 2m + 5
3x² - 6x + 7 = 2m + 5
g(m) = 2m + 5
g(x) = 2x + 5
semoga membantu ya :)