Question

a=-2 e b=-3 a²-ab+b²?

Answer 1

a²-ab+b² =

(a-b)² +ab

(-2+3)² +(-2).(-3)

(1) + 6

7 ✓

ou:

a² -ab +b²

(-2)² -(-2).(-3) + (-3)²

4 - 6 + 9

13 - 6

7 ✓