Question

Решите уравнение
$-frac{4}{7} x^{2} + 28 = 0$

Answer 1

$- frac{4}{7} x^{2} + 28 = 0$
$- frac{4}{7} x^{2} = - 28$
$x^{2} = frac{- 28}{- frac{4}{7} } = frac{28 * 7}{4} = 7 * 7 = 49$
$X1= sqrt{49} = 7$
$X2= - sqrt{49} = - 7$

Answer 2

Спасибо огромное