Well, for 20 you just add them, to get 4 x 2 − x + 3 . For 21, you do a substraction: 2 x 2 + 7 x − 11 . It'd take him quite some time (does this one even have zeros? :)) )
His **speed **was 2x² + 7x - 11 as he walked against the moving walkway.
What is a function?
**Function **is a type of relation, or rule, that maps one input to specific single output.
We are given that **Carlos **is walking on a moving walkway. His speed is given by the function
C(x) = 3x² + 3x - 4,
The **speed **of the walkway is W(x) = x² - 4x + 7.
The total speed as he walks along the moving **walkway **is;
x² - 4x + 7+ 3x² + 3x - 4,
= 4x² - x + 3,
Given Carlos turned around because he left his cell phone at a restaurant.
If he walked **against **the moving walkway
x² + 4x - 7 + 3x² + 3x - 4,
2x² + 7x - 11
Learn more about **function **here:
https://brainly.com/question/2253924
#SPJ2
Carlos's total speed on the moving walkway is S ( x ) = 4 x 2 − x + 3 , and his speed going against it is S a g ain s t ( x ) = 2 x 2 + 7 x − 11 .
;