Question

produtos notáveis quanto é (1.2+d)²​

Answer 1

$(1.2+d)^2~=~(1.2+d)~.~(1.2+d)\\\\\\Aplicando~a~propriedade~distributiva~da~multiplicacao\\\\\\=~1.2~.~1.2~+~1.2~.~d~+~d~.~1.2~+~d~.~d\\\\\\=~1.44~+~1.2d~+~1.2d~+~d^2\\\\\\=~\boxed{d^2\,+\,2.4d\,+\,1.44}$