x^4-x^2=x^2-8

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


Simplifying
x4 + -1x2 = x2 + -8

Reorder the terms:
-1x2 + x4 = x2 + -8

Reorder the terms:
-1x2 + x4 = -8 + x2

Solving
-1x2 + x4 = -8 + x2

Solving for variable 'x'.

Reorder the terms:
8 + -1x2 + -1x2 + x4 = -8 + x2 + 8 + -1x2

Combine like terms: -1x2 + -1x2 = -2x2
8 + -2x2 + x4 = -8 + x2 + 8 + -1x2

Reorder the terms:
8 + -2x2 + x4 = -8 + 8 + x2 + -1x2

Combine like terms: -8 + 8 = 0
8 + -2x2 + x4 = 0 + x2 + -1x2
8 + -2x2 + x4 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
8 + -2x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -2x2 + -8 + x4 = 0 + -8

Reorder the terms:
8 + -8 + -2x2 + x4 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -2x2 + x4 = 0 + -8
-2x2 + x4 = 0 + -8

Combine like terms: 0 + -8 = -8
-2x2 + x4 = -8

The x term is -2x2.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x2 + 1 + x4 = -8 + 1

Reorder the terms:
1 + -2x2 + x4 = -8 + 1

Combine like terms: -8 + 1 = -7
1 + -2x2 + x4 = -7

Factor a perfect square on the left side:
(x2 + -1)(x2 + -1) = -7

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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