Question

how to rationalze a denominator

Answer 1

multiply and divide the same no. of its opposite

Answer 2

Multiply Both Top and Bottom by a Root. Sometimes we can just multiply both top and bottom by a root: ...Multiply Both Top and Bottom by the Conjugate. There is another special way to move a square root from the bottom of a fraction to the top ... we multiply both top and bottom by the conjugate of the denominator.