Carlos is walking on a moving walkway. His speed is given by the function
C(x) = 3 x
2
+ 3x - 4, and the speed of the walkway is W(x) = x
2 - 4x + 7.
20. What is his total speed as he walks along the moving walkway?
21. Carlos turned around because he left his cell phone at a restaurant.
What was his speed as he walked against the moving walkway?
Well, for 20 you just add them, to get [tex]4x^2-x+3[/tex]. For 21, you do a substraction: [tex]2x^2+7x-11[/tex]. It'd take him quite some time (does this one even have zeros? :)) )