Misc 1 - Chapter 1 Class 12 Relation and Functions
Last updated at Dec. 17, 2018 by Teachoo
Transcript
Misc 1 Let f : R R be defined as f(x) = 10x+ 7. Find the function g : R R such that gof= fog= IR Here g is the inverse of f Finding inverse Step 1 f(x) = 10x + 7 Let f(x) = y y = 10x + 7 y 7 = 10x 10x = y 7 x = 7 10 Let g(y) = 7 10 where g: Y N Step 2: gof = g(f(x)) = g(10x + 7) = 10 + 7 7 10 = 10 + 7 7 10 = 10 10 = x = IR Step 3: fog = f(g(y)) = f((๐ฆ โ 7)/10) = 10 ((๐ฆ โ 7)/10) + 7 = y โ 7 + 7 = y + 0 = y = IR Since gof = fog = IR, f is invertible & Inverse of f = g(y) = (๐ โ ๐)/๐๐
Finding Inverse
Identity Function
Inverse of a function
How to check if function has inverse?
Example 22
Ex 1.3, 5
How to find Inverse?
Example 28 Important
Misc 11
Ex 1.3, 11 Important
Example 27
Example 23 Important
Misc 1 You are here
Ex 1.3 , 6 Important
Ex 1.3 , 14 Important
Misc 2
Ex 1.3 , 4
Example 24
Ex 1.3 , 8
Example 25 Important
Ex 1.3 , 9 Important
Chapter 1 Class 12 Relation and Functions
Concept wise
- Relations - Definition
- Empty and Universal Relation
- To prove relation reflexive, transitive, symmetric and equivalent
- Finding number of relations
- Function - Definition
- To prove one-one & onto (injective, surjective, bijective)
- Composite functions
- Composite functions and one-one onto
- Finding Inverse
- Inverse of function: Proof questions
- Binary Operations - Definition
- Whether binary commutative/associative or not
- Binary operations: Identity element
- Binary operations: Inverse
About the Author
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.