Question

encontre as raízes da equação pelo método de completar quadrados x²+12×=28

Answer 1

$\mathsf{x^2+12x=28}\\\mathsf{x^2+12x+36=36+28}\\\mathsf{(x+6)^2=64}\\\mathsf{x+6=\pm\sqrt{64}}\\\mathsf{x+6=\pm8}\\\mathsf{x+6=8}\\\mathsf{x=8-6}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{x=-2}}}}}\\\mathsf{x+6=-8}\\\mathsf{x=-6-8}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{x=-14}}}}}$

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