Question

alguem me ajuda nessa (x+3)²=16

Answer 1

vamos lá...

$(x+3)^2=16 \\ \\ x+3=\pm \sqrt{16} \\ x+3=\pm4 \\ \\ x+3=4~~~~~~~~~~~~~~~~~~~x+3=-4 \\ x=4-3~~~~~~~~~~~~~~~~~~~x=-4-3 \\ x=1~~~~~~~~~~~~~~~~~~~~~~~~x=-7 \\ \\ S=\{-7,1\}$