Помогите решить уравнение
9х^4-82х^2+9=0

X^2 = A ; A > 0------------9A^2 - 82A + 9 = 0D = 6724 - 324 = 6400 ; √ D = 80 A1 = ( 82 + 80 ) : 18 = 9 A2 = ( 82 - 80 ) : 18 = 2/18 = 1/9 ----------------X^2 = 9 X1 = 3 X2 = - 3 ---------------X^2 = 1/9 X3 = 1/3 X4 = - 1/3