Vaehbug4870 Vaehbug4870
  • 19-02-2020
  • Mathematics
contestada

Let f(x)= -5x + 3 and g(x) = 6x – 2. Find f•g and its domain.

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aabdulsamir
aabdulsamir aabdulsamir
  • 23-02-2020

Answer: -30x + 13 or 15x² - 14x + 3

Step-by-step explanation:

Given f(x) = -5x +3 and g(x) = 6x - 2

f•g could mean f(g(x)) or f(x) * g(x)

For f(g(x))

(f(g(x)) = -5(6x-2) + 3

= -30x + 10 + 3

= -30x + 13

which is defined for all Real values of x

Domain = R

Or

f(x)*g(x) = (-5x +3) * (6x -2)

= -30x² + 10x + 18x - 6

= -30x² + 28x - 6

Rearranging the equation,

= 30x² - 28x + 6

Divide through by 2 to make the answer smaller,

f(x)*g(x) = 15x² - 14x + 3

Which is defined for all Real values of x

Domain= R

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