Understand the concept
A one-to-one function never maps two different inputs to the same output.
Is f(x)=2x+3 one-to-one over real numbers?
- Step 1: If f(a)=f(b), then 2a+3=2b+3
- Step 2: a=b.
Final answer: Yes
Is f(x)=x² one-to-one on all real numbers?
Show the answer
No
Try another similar question and explain each step aloud. Refer to your school syllabus for topic level and notation.