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Crazy boy [7]
3 years ago
15

Find f-1(x) if f(x) = 4x + 5.​

Mathematics
2 answers:
LUCKY_DIMON [66]3 years ago
8 0

Answer:

f^{-1}(x) = \frac{x-5}{4}

Step-by-step explanation:

let y = f(x) and rearrange making x the subject.

y = 4x + 5 ( subtract 5 from both sides )

y - 5 = 4x ( divide both sides by 4 )

\frac{y-5}{4} = x

Change y back into terms of x

f^{-1}(x) = \frac{x-5}{4}

Anton [14]3 years ago
3 0

Answer:

(x - 5)/4

Step-by-step explanation:

y = 4x + 5

Make x the subject

x = (y - 5)/4

Interswitch x and y

(f^-1)(x) = (x - 5)/4

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