Andrewisbadatmath
Consider the functions f(x) = 2(x − 9) and g(x) = 4x. What is the value of (f − g)(5)?
12
28
20
−28



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ZeHanz
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Just remember: (fg)(5)=f(5)g(5)

Andrewisbadatmath
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So what do i plug in?

ZeHanz
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Plug in 5 in both of the functions and subtract the outcomes.

Andrewisbadatmath
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so, f(5) = 2(59) and g(5)=4 times 5?

Andrewisbadatmath
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now i am confused

dpaInc
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simplify
f(5) = ???
g(5) = ???

dpaInc
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you got it right earlier... just need to simplify....


ZeHanz
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@Andrewisbadatmath: right, and if you've found f(5) and g(5), you calculate their difference: f(5)  g(5)

Andrewisbadatmath
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ok thank you

ZeHanz
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YW!

Andrewisbadatmath
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so it is 12?

Andrewisbadatmath
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no i meant 12

ZeHanz
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f(5) = 2(59) = 2*(4)=...
g(5) = 4*5 = ...
f(5)  g(5) = ... (not 12)

ZeHanz
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You will get 8  20 = ...