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b) (4 + xy) (x+y) = 4x+4y+x²y+xy²
c) (x² + y²) (x+y+xy) = x³+x²y+x³y+xy²+y³+xy³
(m+2) (m² + 4m +1) = m³+4m²+m+2m²+6m+2= m³+6m²+7m+2