given
by f(x) = 9x2 + 6x ?5. Show that f is invertible with 
Answer:
Given
f(x) = 9x2 + 6x ? 5, Df = R+
Injectivity
: Let x1, x2 be any two elements of R+
such that f(x1) = f(x2)
Surjective
: Let y be any element of [?5, 
)
then
y
= f(x) 
Since
, therefore 
is not
possible.
co-domain
is onto.
is both
one-one and onto.
exists.
To
find inverse of f :
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