Question

2/7x^2-3,5=0
решите уравнение

Answer 1

$\frac{2}{7} x^{2} - 3,5 = 0\\\frac{2}{7}x^{2} - \frac{7}{2} = 0\\4x^{2} - 49 = 0\\4x^{2} = 49\\x^{2} =\frac{49}{4} \\x_{1} = -\frac{7}{2} = - 3,5; x_{2} = \frac{7}{2} = 3,5$