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GenaCL600 [577]
3 years ago
14

If ƒ(x ) = 3x + 1 and ƒ -1 = , then ƒ -1(7) =

Mathematics
1 answer:
Elden [556K]3 years ago
6 0
F(x) = 3x + 1

let f(x) = y

y = 3x + 1

y - 1 = 3x

3x = y - 1

x = (y - 1)/3

From y = f(x),  x = f⁻¹(y) 

<span>x = (y - 1)/3
</span>
 f⁻¹(y)  = (y - 1)/3

f⁻¹(7)  = <span>(7 - 1)/3 = 6/3 = 2

</span>f⁻¹(7)<span> = 2</span>
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