How would I solved this question?

Answer:
4
Step-by-step explanation:
First expand the √8
thus √4 ×√2
but √4 =2
given you 2×√2
=
[tex]2 \sqrt{2} [/tex]
=
[tex] \sqrt{2} \times 2 \sqrt{2} = 2 \times 2[/tex]
=4.