Answer:
(x+5)²-10x²
Step-by-step explanation:
USing the completing square method
x² +25
= (x)² +2(x)(5) +(5)² -10x²
=(x+5)²-10x²
Answer:
21.3541565041
Step-by-step explanation:
You can look it up online to easily find it. Thats how i found this answer.
Hope this helps!
Answer:
Answer: x<7.1
Step-by-step explanation:

Answer:
2.8
Step-by-step explanation:
using cosine rule
= 
s =
= 2.842 = 2.8