anonymous
  • anonymous
Given the function f(x) = 2(x + 4), find x if f(x) = 20.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
\[20 = 2(x+4) \rightarrow 20=2x+8\rightarrow12=2x \rightarrow x = 6\]
anonymous
  • anonymous
It's not 48?
anonymous
  • anonymous
If you plug in x =6 to the function you will see it comes out to 20.

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anonymous
  • anonymous
If you are trying to solve for f(20) then yes it's 48.
anonymous
  • anonymous
Where did you get 6 from?
anonymous
  • anonymous
look at the equation I showed you; all the steps are there
anonymous
  • anonymous
\[20=2(x+4)→20=2x+8→12=2x→x=6\]
anonymous
  • anonymous
\[f(x) = 2(x + 4)\]what the question is asking is to find what value of x would make the function equal 20, so x=? so that f(x)=20:\[20=2(x+4)\]\[20=2x+8\]\[12=2x\]\[6=x\]so when x=6, the function equals 20, so x=6 so that f(6)=20
anonymous
  • anonymous
we can check that to be true:\[f(6)=2(6+4)\]\[f(6)=2(10)\]\[f(6)=20~\checkmark\]

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