Question

Rationalising factor of 5 +root 7

Answer 1

Answer:

Therefore, lowest rationalizing factor is ( 7 + √7 ).

Step-by-step explanation:

follow me

mark me as BRAINLIEST

100%sure

Answer 2

Answer:

5 - $\sqrt{7}$

Step-by-step explanation:

To rationalise the factor multiply by the conjugate factor

The conjugate of 5 + $\sqrt{7}$ is 5 - $\sqrt{7}$ , then

(5 + $\sqrt{7}$ )(5 - $\sqrt{7}$ ) ← expand using FOIL

= 5² - ($\sqrt{7}$ )²

= 25 - 7

= 18