Question

Resolva as seguintes equações do 2 grau em R : a) 2x^2 - 50 = 0 B) 3x^2 - 8x = 0

Answer 1

a)

$2x^2-50~=~0\\\\\\2x^2~=~50\\\\\\x^2~=~\frac{50}{2}\\\\\\x~=~\pm\sqrt{25}\\\\\\\boxed{x'~=~5}\\\\\\\boxed{x''~=~-5}$

b)

$3x^2-8x~=~0\\\\\\x\,.\,(3x-8)~=~0\\\\\\\boxed{x'~=~0}\\\\\\3x-8~=~0\\\\3x~=~8\\\\\boxed{x''~=~\frac{8}{3}}$