Question

Please help me with this!!! I will mark brainliest!!

Answer 1

Hello from MrBillDoesMath!

Answer:

-9 sqrt(5)

Discussion:

-2 sqrt(20) -  sqrt(125) =

-2 *2 sqrt(5) - sqrt(125)=                                as 20 = 4* 5

-4sqrt(5)- 5 sqrt(5)  =                                      as 125 = 25 *5

(-4 -5) sqrt(5) =

-9 sqrt(5)

Thank you,

MrB