Question

the value of expression a2+b2+3ab at a =1 and b =(-2)​

Answer 1

a2+b2+2ab+ab
(a+b)2+ab
(1-2)2+1 x -2
1-2
-1⬅️
.
.
Yo_XD

Answer 2

Answer:

a²+b²+3ab

=> (-1)²+(2)²+3(-1)(2)

=> 1+(-6)+4

=> 5+(-6)

=> 5-6

=> (-1) (Answer)

Hope you understood.

Mark as Brainliest