NDA2015MathematicsFunctionsActual
Consider the following statements : Statement 1: The function f R R such that f ( x )= x ^3 for all x R is one-one. Statement 2: f(a) f(b) for all a, b R if the function f is one-one. Which one of the following is correct in respect of the above statements?
Options
- ABoth the statements are true and Statement 2 is the correct explanation of Statement 1.
- BBoth the statements are true and Statement 2 is not the correct explanation of Statement 1.
- CStatement 1 is true but Statement 2 is false.
- DStatement 1 is false but Statement 2 is true.
Correct answer
A. Both the statements are true and Statement 2 is the correct explanation of Statement 1.
Step-by-step solution
aligned & f ( x )= x ^3 & f ( x ₁ )= x ₁^3 & f ( x ₂ )= x ₂^3 & if x ₁= x ₂ & then f ( x ₁ )= f ( x ₂ ) aligned So it is one-one function Hence option (1) is correct.