Q. 21 A5.0( 1 Vote )

Let A = [–1, 1].

Answer :

Given that, A = [–1, 1]

Let f(x₁) = f(x₂)

⇒

⇒ 2x₁ = 2x₂

⇒ x₁ = x₂

⇒ f is one one

Now, let f(x) = y

⇒

⇒ 2y= x

⇒ for y=1 ∈ A we will have x = 2 ∉ A

⇒ f is not onto

Thus, f is one-one and not onto.

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