county line on the lake
.
/ // /. . 100m
() () : : 549-15 : ( ) : 2026.03.05
. .
, . . 1. . : 25,000~30,000 . 2. .
. . C 1.5~4 .
(5) ! .
. . . .
, . , .
85-616 : 010-2836-5717 | : kimhr409@naver.com COPYRIGHT ALL RIGHTS RESERVED.
Related Articles
Trending Articles
Let \( a \) and \( b \) be complex numbers such that \( a + b = 4 \) and \( a^2 + b^2 = 10 \). Find \( |a - b| \).
\( a + b = 4 \)
\( a^2 + b^2 = 10 \)
We use the identity:
Substitute:
4^2 = 10 + 2ab \Rightarrow 16 = 10 + 2ab \Rightarrow 2ab = 6 \Rightarrow ab = 3
Now compute \( |a - b| \). Note:
|a - b|^2 = (a - b)(\overline{a} - \overline{b}) = |a|^2 - a\overline{b} - \overline{a}b + |b|^2
But better to use algebra:
|a - b|^2 = (a - b)^2 \quad ext{if real, but not necessarily.}