Question

квадтратное уравнения 7x^2-4=0

Answer 1

$7x^2-4=0 \ 7x^2=4 \ x^2= frac{4}{7} \ x_{1}= sqrt{ frac{4}{7} }= frac{2}{ sqrt{7} }= frac{2 sqrt{7} }{7} \ x_{2} =- frac{2 sqrt{7} }{7}$