I think I could help you
Have fun and feel free to ask me something new.
Or we can prove some properities without calculating by details
Answer:1. 7 2. 
Step-by-step explanation:
1. 
= 7
2. ( doesn't have any simplest radical form)
Use the polynomial remainder theorem. It says that a polynomial 
has remainder 
upon division by 
.
Here we have
and 
, so the remainder is
Answer:
Step-by-step explanation:
R=S -5/6
Answer:
Gọi AH là đường cao kẻ từ A đến BC
Xét tam giác AHC vuông tại H
Suy ra AH = HC. cotA= 9.cot35° = 12,9
Xét tam giác AHB vuông tại H
Suy ra BH = AH.tanA = 12,9.tan61°=23,37
Ta có BC= HC+ HB= 9+23,27 =32,27
Diện tích tam giác ABC = 1/2 × AH ×BC= 1/2 ×12,9×32,27=208,1415
