Formula deep page
Rationalising Factor
Multiply by conjugate: (a+√b)(a-√b) = a²-b
This formula belongs to the chapter "Number Systems" in Class 9 Mathematics. Use it after identifying the right variables, matching the chapter context, and writing the substitution clearly.
How to use it
- Identify the quantity you need to find.
- Check the related variables and units from the question.
- Substitute values carefully into the formula.
- Simplify step by step and write the final statement.
Worked cue
Rationalise 1/(√2+1): multiply by (√2-1)/(√2-1) = (√2-1)/(2-1) = √2-1