8x^4-18x^2+45=0

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Solution for 8x^4-18x^2+45=0 equation:


Simplifying
8x4 + -18x2 + 45 = 0

Reorder the terms:
45 + -18x2 + 8x4 = 0

Solving
45 + -18x2 + 8x4 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
5.625 + -2.25x2 + x4 = 0

Move the constant term to the right:

Add '-5.625' to each side of the equation.
5.625 + -2.25x2 + -5.625 + x4 = 0 + -5.625

Reorder the terms:
5.625 + -5.625 + -2.25x2 + x4 = 0 + -5.625

Combine like terms: 5.625 + -5.625 = 0.000
0.000 + -2.25x2 + x4 = 0 + -5.625
-2.25x2 + x4 = 0 + -5.625

Combine like terms: 0 + -5.625 = -5.625
-2.25x2 + x4 = -5.625

The x term is -2.25x2.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25x2 + 1.265625 + x4 = -5.625 + 1.265625

Reorder the terms:
1.265625 + -2.25x2 + x4 = -5.625 + 1.265625

Combine like terms: -5.625 + 1.265625 = -4.359375
1.265625 + -2.25x2 + x4 = -4.359375

Factor a perfect square on the left side:
(x2 + -1.125)(x2 + -1.125) = -4.359375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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