If f(x)=5x+a and f-1(10)=-1, find a
1 answer:
Answer:
15
Step-by-step explanation:
Given the function

and 
let f(x)=y
Substitute in f(x)

From the definition inverse function
if
⇒ 
Substitute this in the above expression

Substitute y=10
⇒

Therefore a=15
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