{ a 2 + b 2 + c 2 + d 2 + e 2 = a ( b + c + d + e ) 2 0 1 1 a + 2 0 1 2 b + 4 0 2 6 c + 2 0 1 4 d + 4 0 3 0 e = 1 6 2 3 2 8 3 2 Find the value of below expression. 9 a + b + c + d + e
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.
The main trick is to multiply the first equation through by 4 which results in:
4 ( a 2 + b 2 + c 2 + d 2 + e 2 ) = 4 a ( b + c + d + e ) ;
or ( a 2 − 4 a b + 4 b 2 ) + ( a 2 − 4 a c + 4 c 2 ) + ( a 2 − 4 a d + 4 d 2 ) + ( a 2 − 4 a e + 4 e 2 ) = 0 ;
or ( a − 2 b ) 2 + ( a − 2 c ) 2 + ( a − 2 d ) 2 + ( a − 2 e ) 2 = 0 ;
or b = c = d = e = 2 a .
If we now substitute these values into the second linear equation, we now obtain:
2 0 1 1 a + ( 2 a ) ( 2 0 1 2 + 4 0 2 6 + 2 0 1 4 + 4 0 3 0 ) = 1 6 2 3 2 8 3 2 ⇒ a = 2 0 1 6 ;
and our final calculation comes to:
9 a + b + c + d + e = 9 a + 4 ( 2 a ) = 3 a = 3 2 0 1 6 = 6 7 2 .
Problem Loading...
Note Loading...
Set Loading...