x^4-8x^8=16

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Solution for x^4-8x^8=16 equation:


Simplifying
x4 + -8x8 = 16

Solving
x4 + -8x8 = 16

Solving for variable 'x'.

Reorder the terms:
-16 + x4 + -8x8 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + x4 + -8x8 = 0

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

Divide each side by '-8'.
2 + -0.125x4 + x8 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -0.125x4 + -2 + x8 = 0 + -2

Reorder the terms:
2 + -2 + -0.125x4 + x8 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -0.125x4 + x8 = 0 + -2
-0.125x4 + x8 = 0 + -2

Combine like terms: 0 + -2 = -2
-0.125x4 + x8 = -2

The x term is x4.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.125x4 + 0.25 + x8 = -2 + 0.25

Reorder the terms:
0.25 + -0.125x4 + x8 = -2 + 0.25

Combine like terms: -2 + 0.25 = -1.75
0.25 + -0.125x4 + x8 = -1.75

Factor a perfect square on the left side:
(x4 + 0.5)(x4 + 0.5) = -1.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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