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