Question

sabendo que x elevado a 2+ y elevado a 2=27 e xy=14, determine o valor de (x+y) elevado a 2

Answer 1

$(x+y)^2= \\ \\ calcular \\ \\ (x+y)(x+y)= \\ x^2+xy+xy+y^2= \\ \\ x^2+2xy+y^2= \\ x^2+y^2+2xy= \\ \\ substituir~~x^2+y^2~~por~~27~~~e~~xy~~por ~~14 \\ \\ 27+2(14)= \\ 27+28=58$