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enyata [817]
3 years ago
8

If f(x+1)=3x+4,find f(x) and f(3).​

Mathematics
1 answer:
dexar [7]3 years ago
4 0

f(x+1)=3x+4

  • Let y be x+1
  • So x=y-1

\\ \sf\longmapsto f(y)=3(y-1)+4

\\ \sf\longmapsto f(y)=3y-3+4

\\ \sf\longmapsto f(y)=3y+1

\\ \sf\longmapsto f(x)=3x+1\checkmark

\\ \sf\longmapsto f(3)

\\ \sf\longmapsto 3(3)+1

\\ \sf\longmapsto 9+1

\\ \sf\longmapsto 10

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