3x^4-8x^2+18=0

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Solution for 3x^4-8x^2+18=0 equation:


Simplifying
3x4 + -8x2 + 18 = 0

Reorder the terms:
18 + -8x2 + 3x4 = 0

Solving
18 + -8x2 + 3x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
6 + -2.666666667x2 + x4 = 0

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + -2.666666667x2 + -6 + x4 = 0 + -6

Reorder the terms:
6 + -6 + -2.666666667x2 + x4 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -2.666666667x2 + x4 = 0 + -6
-2.666666667x2 + x4 = 0 + -6

Combine like terms: 0 + -6 = -6
-2.666666667x2 + x4 = -6

The x term is -2.666666667x2.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667x2 + 1.777777780 + x4 = -6 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x2 + x4 = -6 + 1.777777780

Combine like terms: -6 + 1.777777780 = -4.22222222
1.777777780 + -2.666666667x2 + x4 = -4.22222222

Factor a perfect square on the left side:
(x2 + -1.333333334)(x2 + -1.333333334) = -4.22222222

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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