Question

Resolva as equações d 2º grau incompletas:

a)2x²=50

b)x²/5=20

c)x²-2x=0

Answer 1

Vejamos: a) 2x^2 = 50 x^2 = 50/2 x^2 = 25 x = +-√25 x = +-5 S = {5,-5} b) x^2/5 = 20 x^2 = 100 x = +-√100 x = +-10 S = {10,-10} c) x^2 - 2x = 0 x.(x - 2) = 0 x = 0 x - 2 = 0 x = 2 S = {0,2}