Respuesta :

To find f(x)-g(x), find (3x-21)-(3x+21)

(3x-21)-(3x+21)

Flip the signs in the second binomial
(3x-21)-3x-21

Combine like terms
3x-3x-21-21
-21-21
-42

The final answer is -42. X is irrelevant because whatever you plug in will always equal -42.
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