in the process of rationalization for ✓(a+b) , what other numbers is operated with ? and why
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Rationalize the Denominator

We rationalize the denominator to ensure that it becomes easier to perform any calculation on the fraction. When we rationalize the denominator in a fraction, then we are eliminating any radical expressions such as square roots and cube roots from the denominator. In this article, let's learn about rationalizing the denominator, its meaning, and methods with some examples.
What is Rationalizing?
Rationalizing is the process of multiplying a surd with another similar surd, to result in a rational number. The surd that is used to multiply is called the rationalizing factor (RF).
To rationalize √x we need another √x: √x × √x = x.
To rationalize a +√b we need a rationalizing factor a -√b: (a +√b) × (a +√b) = (a)2 - (√b)2 = a2 - b
The rationalizing factor of 2√3 is √3: 2√3 × √3 = 2 × 3 = 6
Answer:
√(a-b) because of formula
(a+b) X (a-b)= a square - b square