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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.

  1. What is his total speed as he walks along the moving walkway?
  2. Carlos turned around because he left his cell phone at a restaurant.

What was his speed as he walked against the moving walkway?

Verified Answer :

Well, for 20 you just add them, to get \(4x^2-x+3\). For 21, you do a substraction: \(2x^2+7x-11\). It'd take him quite some time (does this one even have zeros? :)) )

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