a² - 6a +b² - 4b + 13 = 0
9 + 4 =13
( a² - 6a + 9) + ( b² -4b + 4) = 0
( a - 3 )² + ( b - 2)² = 0 daca a -3 = 0 ; b - 2 = 0
a = 3 ; b =2
E ( 3 ;2) = ( 2·3 - 3·2 - 1)²⁰¹¹ + ( 3 -2)²⁰¹² + ( 5·3 - 7·2)²⁰¹³ =
= ( - 1) ²⁰¹¹ + 1²⁰¹² + 1²⁰¹³ =
= - 1
E ( 3 ;2) = -1 + 1 + 1 =1