Question

Rationalised the denominator of the roote 7​

Answer 1

firstly, change the sign of the denominator , i.e √7 - √2 will become √7 + 2 , so multiply this term both with numerator and denominator. Multiply the terms , and we know that (a+b)(a-b) = a² - b² , use this identity for denominator! solve it more , square root and square will cancel out!

Answer 2

Answer:

do you mean what I have done below

Step-by-step explanation:

1/$\sqrt{7}$

now mutiply both the denominator and numerator by $\sqrt{7}$

$\frac{1}{\sqrt{7} }$ * $\frac{\sqrt{7} }{\sqrt{7} }$ =$\frac{\sqrt{7} }{7}$

that is your answer