Question

a^{2} + b^{2} + c^{2} - 2ab - 2ac +2bc si A= 4 B= 3 C= 2

Answer 1

a² + b² + c² - 2ab - 2ac +2bc

Reemplazando: a=4; b=3 y c=2, tenemos:
4² + 3² + 2² -2(4)(3) - 2(4)(2) +2(3)(2)
=16 +9 +4 - 24 -16 +12
=-7