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g(x) = x - 3
f(x).g(x) = (x² + 2x - 1)(x - 3)
= x(x² + 2x - 1) - 3(x² + 2x - 1)
= x³ + 2x² - x - 3x² - 6x + 3
= x³ - x² - 7x + 3
mohon koreksi lagi...
g(x)=