Question

If f(x) = x^2-4x+6 ,then f(1)-f(-1) is *

Answer 1

Answer:

y is one-one & onto

⇒ inverse exists  

y=f(x)=−2x+6

⇒−2x=y−6

⇒x=  

2

−1

​

(y−6)

x=−y/2+3

⇒f  

−1

(x)=  

2

−x

​

+3

Answer 2

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