Note: Steps of student are not given. So, the proper steps of the solution are provided below.
Given:
The inequality is

To find:
Where the student made any errors?
Solution:
We have,

On dividing both sides -5 change the sign of equality because -5 is a negative number.


Therefore, the solution of given inequality is
.
Answer:
6x + 35
Step-by-step explanation:
distribute three and five through parenthesis
remove parenthesis
collect like terms
calculate
8x+3(x+5)-5(x-4)
8x+3x+15-5x+20
6x+35
Sqrt(80) = Sqrt(16) x sqrt(5)
= 4 x sqrt(5)
300 is the answer to the question