3. The fuel used by a car is defined by f(x)=3x=/80-6x+245. where x is the travelling speed in km/h. What is the most economical speed of the car? In other words, determine the speed of the car which uses the least amount of fuel.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter9: Quadratic Functions And Equations
Section9.9: Combining Functions
Problem 50HP
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3. The fuel used by a car is defined
by f(x)=3x=/80-6x+245. where x is the
travelling speed in km/h.
What is the most economical speed of
the car? in other words, determine the
speed of the car which uses the least
amount of fuel.
Transcribed Image Text:3. The fuel used by a car is defined by f(x)=3x=/80-6x+245. where x is the travelling speed in km/h. What is the most economical speed of the car? in other words, determine the speed of the car which uses the least amount of fuel.
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