Question

given that a function is defined by f(x)=2x-3,evaluate f(1)

Answer 1

Answer:

Let x

1

and x

2

be any two elements of N.

∴f(x

1

)=f(x

2

)

⇒2x

1

+3=2x

2

+3

⇒x

1

=x

2

∴f is one-one function.

Now, let y=2x+3⇒x=

2

y−3

It is not onto function, because for y=3,x=0∈

/

N.

Hence, it is one-one into function.

Video Explanation