⎩ ⎨ ⎧ a 2 + b 2 + c 2 = 1 8 a b + b c + c a = 9
If a , b , and c satisfy the system of equations above, what is the value of ∣ a ∣ + ∣ b ∣ + ∣ c ∣ ?
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( a + b + c ) ( a + b + c ) 2 = 1 8 + 2 ( 9 ) = 3 6 a + b + c = ± 6 ∣ a ∣ + ∣ b ∣ + ∣ c ∣ = 6 only if a , b , c ≥ 0 or a , b , c ≤ 0 . For example, a = 2 , b = 7 , c = − 3 ⟹ a + b + c = 6 but ∣ a ∣ + ∣ b ∣ + ∣ c ∣ = 1 2
Problem Loading...
Note Loading...
Set Loading...
I will share a solution soon, but here are two examples of possible values for a , b , c that satisfy the system of equations above , but ∣ a ∣ + ∣ b ∣ + ∣ c ∣ is not the same , watch out that a , b , c can be complex
if a , b , c are a = 0 , b = 3 , c = 3 these values satisfy the system of equations above and |a|+|b|+|c|=6
if a , b , c are a = 1 0 , b = − 2 − i 4 5 , c = − 2 + i 4 5 these values satisfy the system of equations above and |a|+|b|+|c|=24