Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

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Chapter 1 Class 12 Relation and Functions

Serial order wise

Last updated at June 6, 2023 by Teachoo

Example 9 Prove that the function f : R → R, given by f (x) = 2x, is one-one and onto. f(x) = 2x Checking one-one f (x1) = 2x1 f (x2) = 2x2 Putting f(x1) = f(x2) 2x1 = 2 x2 x1 = x2. Hence, if f(x1) = f(x2) , x1 = x2 ∴ function f is one-one Onto f(x) = 2x Let f(x) = y, , such that y ∈ R 2x = y x = 𝑦/2 Since y is a real number, Hence 𝑦/2 will also be a real number So, x will also be a real number, i.e., x ∈ R Hence, f is onto