Question

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

Answer 1

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