Question

Need help with question

Answer 1

-1 ± 2√10

Explanation:

first of all, do -2 on top divided by 2 on bottom to get 1st part of answer -1.

now (2√40) / 2 = 1√40 which just equals √40.

√40 = √(4 X 10) = √4 X √10 = 2 X √10 = 2√10.

so our final answer becomes -1 ± 2√10