Question

Evaluate:- ab+bc+ca-a²-b²-c² when a=2. b=3. c=(-3) ​

Answer 1

Answer:

Step-by-step explanation:

Given that,

a = 2 , b = 3 and c = - 3.

ab + bc +ca - a² - b² - c²

= ( 2 × 3 ) + ( 3 × - 3 ) + ( - 3 × 2 ) - ( 2 )² - ( 3 )² - ( - 3 )²

= 6 + ( - 9 ) + ( - 6 ) - 4 - 9 - 9

= 6 - 9 - 6 - 4 - 9 - 9

= 6 - 37

= - 31 is the answer