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a. g(2) = 5.(2)-7 = 3
(fog)(2) = f(g(2)) = 3²-4(3)+5 = 9 - 12 + 5 = 2
b. f(3) = 3²-4(3)+5 = 9 - 12 + 5 = 2
gof(3) = g(f(3)) = 5(2)-7 = 10-7 = 3
= -10 - 7
= -17
fog(-2) = -17² - 4(-17) + 5
= 289 + 68 + 5
= 362
b)
f(3) = 3² - 4(3) + 5
= 9 - 12 + 5
= 2
gof(3) = 5(2) - 7
= 10 - 7
= 3
c)
= -(x² - 4x + 5)
= -x² + 4x - 5
= -1² - 4(1) + 5
= 2
= -(5x + 7)
= -5x - 7
(2) = -5(2) - 7
= -17