Question

write the simplest rationalising factor of.
√32
√72
√7- √5
​

Answer 1

Step-by-step explanation:

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Answer 2

• As per the data given in the question, we have to determine the required number.

          Given data:-  

                        $\sqrt{32} \\\sqrt{72}\\ \sqrt{7} - \sqrt{5} .$

          To find:- Rationalise the given values.

          Solution:-

• A number that is multiplied and divided by a whole number is called a rationalizing factor.

1.

       $\sqrt{32} \\=\sqrt{16\times2}\\=4\sqrt{2}.$

2.  

      $\sqrt{72} \\=\sqrt{36\times2}\\=6\sqrt{2}.$

3.  

     $\sqrt{7} -\sqrt{5} .$ this number is irrational.