Question 81305
If f(x)=5x-1, find the following f(a-2)... 
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Comment: f(a-2) tells you to substitute a-2 in place of x:
Your Problem:
f(a-2) = 5(a-2)-1
f(a-2) = 5a-10-1
f(a-2) = 5a-11
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Cheers,
Stan H.