jeff100
jeff100
07-07-2016
Mathematics
contestada
If ƒ(x ) = 3x + 1 and ƒ -1 = , then ƒ -1(7) =
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olemakpadu
olemakpadu
10-07-2016
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)
x = (y - 1)/3
f⁻¹(y) = (y - 1)/3
f⁻¹(7) =
(7 - 1)/3 = 6/3 = 2
f⁻¹(7)
= 2
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