x^4-8x^2=-1728

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Solution for x^4-8x^2=-1728 equation:


Simplifying
x4 + -8x2 = -1728

Reorder the terms:
-8x2 + x4 = -1728

Solving
-8x2 + x4 = -1728

Solving for variable 'x'.

Reorder the terms:
1728 + -8x2 + x4 = -1728 + 1728

Combine like terms: -1728 + 1728 = 0
1728 + -8x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '-1728' to each side of the equation.
1728 + -8x2 + -1728 + x4 = 0 + -1728

Reorder the terms:
1728 + -1728 + -8x2 + x4 = 0 + -1728

Combine like terms: 1728 + -1728 = 0
0 + -8x2 + x4 = 0 + -1728
-8x2 + x4 = 0 + -1728

Combine like terms: 0 + -1728 = -1728
-8x2 + x4 = -1728

The x term is -8x2.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x2 + 16 + x4 = -1728 + 16

Reorder the terms:
16 + -8x2 + x4 = -1728 + 16

Combine like terms: -1728 + 16 = -1712
16 + -8x2 + x4 = -1712

Factor a perfect square on the left side:
(x2 + -4)(x2 + -4) = -1712

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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