Question

Решите уравнение 7x^2-1,4x^4=0

Answer 1

$7x^2-1.4x^4=0$
$1.4x^2(5x^2-1)=0$
$1.4x^2=0; x^2=0; x_1=0$
$5x^2-1=0$
$5x^2=1; x^2=frac{1}{5}$
$x_2=-frac{1}{sqrt{5}}; x_3=frac{1}{sqrt{5}}$
ответ: $0; ^+_- frac{1}{sqrt{5}}$