(12 square root 5 - 7 square root 7) + (6 square root 5- 7 square root 7)

the options are:

18 square root 5 -14 square root 7
18 square root 10 - 14 square root 14
5 square root 2 - square root 12

Question

(12 square root 5 - 7 square root 7) + (6 square root 5- 7 square root 7)

the options are:

18 square root 5 -14 square root 7
18 square root 10 - 14 square root 14
5 square root 2 - square root 12

anonymous · Answer

and 4 square root 10 is the last option

anonymous · Answer

its A

phi · Answer

You do not appear to be learning how to do these problems.  
What part don't  you understand?

anonymous · Answer

I am continuely having trouble with cube root and quad rooting

anonymous · Answer

@nitz thank you for your help

anonymous · Answer

@phi are you in mit?