Determine whether each of these functions is a bijection from ℝ to ℝ. If it is,  write the inverse function.    f(x) = 3|x| − 4

Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter11: Nonlinear Programming
Section11.3: Convex And Concave Functions
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Determine whether each of these functions is a bijection from ℝ to ℝ. If it is, 
write the inverse function. 
 
f(x) = 3|x| − 4  

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