Question

cum se rezolva:
(a+b-c) la a 2
(a-b+c) la a 2
UREGENT!!!
MERSI

Answer 1

$(a+b-c)^{2}=a^{2}+b^{2}+c^{2}+2ab-2ac-2bc$
$(a-b+c)^{2}=a^{2}+b^{2}+c^{2}-2ab+2ac-2bc$