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How Do You Find f(x) If You Have a Value For x?
Given f(x) = 2x-2, find f(-5)
Summary
- f(x) is just a notation for a function
- It means that our function will be using the variable x
- To find f(-5), all we have to do is plug -5 into the function wherever we have an x
- Our function is f(x)=2x-2
- Plug in -5 for x
- 2(-5)=-10
- -10-2=-12
- So f(-5)=-12

Notes
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- f(-5) means that we just plug -5 into our function wherever we have an x
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- f(x) is just a notation for a function
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- Plugging -5 into 2x-2 gives us f(-5)=2(-5)-2
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