Question

find the difference of 9sqrt7 and sqrt28.

Answer 1

you can express 28 as 7x4 . you can take out 4 from the radical sign.

9sqrt7 - sqrt28

9sqrt7- sqrt(7*4)

9sqrt7- 2sqrt 7 (because when you take out 4, you get its square root, sqr4 =2)

You can subtract numbers with the same radical

so

7sqrt7 would be the answer

Answer 2

thanks brah!