Question

-4/7 х^2 + 28 = 0 срочно, помогите

Answer 1

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