3.
f(x) = 3x -5
g(x) = x² -6x
(fog)(x) = ...
(fog)(x) = 3(x² -6x)-5
= 3x² -18x-5
4.
(fog)(x) = 4x² - 20x + 25
f(9(x)) = 4x² - 20x + 25
f(2x -5) = 4x² - 20x² - 20x + 25
f(1/ = 4((x + 7) ÷ 2)² - 20((x + 7) ÷ 2) + 25
f(1) = x² + 14x + 49 - 10x - 70 + 25
f(1) = x² + 4x + 4
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3.
f(x) = 3x -5
g(x) = x² -6x
(fog)(x) = ...
(fog)(x) = 3(x² -6x)-5
= 3x² -18x-5
4.
(fog)(x) = 4x² - 20x + 25
f(9(x)) = 4x² - 20x + 25
f(2x -5) = 4x² - 20x² - 20x + 25
f(1/ = 4((x + 7) ÷ 2)² - 20((x + 7) ÷ 2) + 25
f(1) = x² + 14x + 49 - 10x - 70 + 25
f(1) = x² + 4x + 4