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g(f(x)) = ( 2x - 1 )² + 6 (2x - 1 ) + 9
gof = 4x² - 4x + 1 + 12x - 6 +9
gof = 4x² + 8x + 4
b. fog = f(g(x)) = f( x² + 6x + 9)
fog = 2x - 1
fog = 2(x² +6x +9) - 1
fog = 2x² + 12x + 18 - 1
fog = 2x² +12x +17