WilliamLich WilliamLich

18-07-2020
Mathematics

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IF f(x) = 3x+4 and g(x) = 7x-9. What is f(5)? And what is fg(x)?

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gcantiga44 gcantiga44

18-07-2020

What is f(5)?

f(x) = 3x + 4

f(5) = 3(5) + 4

= 15 + 4

= 19

And what is fg(x)?

f(x) = 3x + 4

g(x) = 7x - 9

fg(x) = (3x + 4) (7x - 9)

= 21x² + x - 36

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