Question

Помогите решить уравнение 9х^4-9х^2+2=0

Answer 1

$9x^4-9x^2+2=0\x^2_{1,2}=frac{9^+_-sqrt{81-72}}{18}=frac{9^+_-3}{18}\\x_1^2=frac{12}{18}=frac{2}{3} x_2^2=frac{6}{18}=frac{1}{3}\x_{1,2}=^+_-sqrtfrac{2}{3} x_{3,4}=^+_-sqrtfrac{1}{3}$