Respuesta :
Answer:
1
Step-by-step explanation:
I was thinking about it and I prepared my paper and pen and started typing the problem but then I realized this...
8+ and 8-
Then I was like
OK....
Answer: 16
Step-by-step explanation:
8+3√21 + 8-3√21
= 8 +8 +3√21 -3√21
= 16