Question

produtos notaveis(y + 2x)2

Answer 1

(y+2x)^2=
(y+2x)(y+2x)=
y^2+2xy+2xy+4x^2=
y^2+4xy+4x^2

Answer 2

(y+2x)² = y²+2*y*2x+(2x)²
(y+2x)² = y²+2*2*xy+2²x²
(y+2x)² = y²+4xy+4x²