Question

As raizes das equação 20x² -2000 = 0 são:

Answer 1

Olá,

$\tt \: 20 {x}^{2} - 2000 = 0 \\ \\ \tt \: 20 {x}^{2} = 2000 \\ \\ \tt \: {x}^{2} = \frac{2000}{20} \\ \\ \tt \: {x}^{2} = \frac{200 \cancel{0}}{2 \cancel{0}} \\ \\ \tt \: {x}^{2} = \frac{200}{2} \\ \\ \tt \: {x}^{2} = 100 \\ \\ \tt \: x = \pm \sqrt{100} \\ \\ \tt \: x = \pm10 \\ \\ \tt \boxed{ \boxed{ \tt S = \{ - 10,10 \}}}$