Question

If A = m2 - mn + n2, B = -m2+mn, C = n2 - m2 -mn.
Find A + B-C. show process​

Answer 1

Step-by-step explanation:

A=m²-mn+n² B= -m²+mn C=n²-m²-mn

A+B-C

m²-mn+n²+(-m²+mn)-(n²-m²-mn)

m²-mn+n²-m²+mn-n²+m²+mn

(1-1+1)m²+(-1+1+1)mn+(1-1)n²

m²+mn