Write the rationalisation factor of 7-3 5. - Vidyadip

Question

Write the rationalisation factor of $7-3\sqrt5.$

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Answer

The rationalizing factor of $\text{a}+\sqrt{\text{b}}$ is $\text{a}-\sqrt{\text{b}}.$ Hence the rationalizing factor of $7-3\sqrt5$ is $7+3\sqrt5.$

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