Question

rationalism factor of 3√7 +5 is ?​

Answer 1

Answer:

Let ‘x’ be the rationalising factor of 5+3√7

=> (5+3√7)(x) = Rational number

Suppose x = 5-3√7, then we get

=>  (5+3√7)(5-3√7) = 25-9(7)

= 25-27

=-2

-2 is a rational number. Therefore 5-3√7 is a rationalising factor

The rationalising factor of 5+3√7 is 5-3√7