Rationalising Factor โ Class 9 Mathematics Formula | MscTutor
Formula deep page
Rationalising Factor
Multiply by conjugate: (a+โb)(a-โb) = aยฒ-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/(โ2+1): multiply by (โ2-1)/(โ2-1) = (โ2-1)/(2-1) = โ2-1
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