Question

1.Simplifique as expressões:


a.(x – 2)² + x² - 2( x – 1)²


b.(m – 1 )² - ( m + 1)(m – 1)

Answer 1

a) x²-4x+4+x²-2(x²-2x+1) = x²-4x+4+x²-2x²+4x-2 = x²+x²-2x²-4x+4x+4-2= 2
b) m²-2m+1-(m²-m+m-1)=m²-2m+1-m²+1=-2m+1