Let f (x) = 4x + 3 and g (x) = - 2x + 5. Find (f x g) (5)

Question

Mathematics

Mayra Jimenez

23 November, 18:40

Let f (x) = 4x + 3 and g (x) = - 2x + 5. Find (f x g) (5)

+4

Answers (1)

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Elsa Craig · Answer 1

F (x) = 4x + 3

the domain: Df = R

g (x) = - 2x + 5

the domain: Dg = R

Df = Dg therefore (f · g) (x) = f (x) · g (x)

f (5) = 4 · 5 + 3 = 20 + 3 = 23

g (5) = - 2 · 5 + 5 = - 10 + 5 = - 5

(f · g) (5) = f (5) · g (5) = 23 · (-5) = - 115