f(x) = 3x + 5; g(x) = 7x + 8 Find f ∙ g.

Find the requested function and state its domain
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1 Answer

Your question could have two meanings.

(1) f.g=fg(x)=(3x+5)(7x+8)=21x2+59x+40; or

(2) f.g=f○g(x)=f(g(x))=f(7x+8)=3(7x+8)+5=21x+24+5=21x+29.

In each case the domain is all x, that is, in (-∞,∞).

by Top Rated User (1.2m points)

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