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21-05-2016
Mathematics

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Given f(x)=x+5 all over 3, solve for f^-1(3) (A. -1; B. 14; C. 18; D. 21)

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apologiabiology apologiabiology

22-05-2016

f^-1 means finverse
find finverse then subsitute 3 for x
to solve

replace f(x) with y
solve for x
switch x with y
replace y with finverse or f^-1

f(x)=(x+5)/3
y=(x+5)/3
3y=x+5
3y-5=x
3x-5=y
finvers=3x-5

fiinverse(3)=3(3)-5
finverse(3)=9-5
finverse(3)=4
why is it not listed again

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