4x^4+81=3x^2

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Solution for 4x^4+81=3x^2 equation:


Simplifying
4x4 + 81 = 3x2

Reorder the terms:
81 + 4x4 = 3x2

Solving
81 + 4x4 = 3x2

Solving for variable 'x'.

Reorder the terms:
81 + -3x2 + 4x4 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
81 + -3x2 + 4x4 = 0

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

Divide each side by '4'.
20.25 + -0.75x2 + x4 = 0

Move the constant term to the right:

Add '-20.25' to each side of the equation.
20.25 + -0.75x2 + -20.25 + x4 = 0 + -20.25

Reorder the terms:
20.25 + -20.25 + -0.75x2 + x4 = 0 + -20.25

Combine like terms: 20.25 + -20.25 = 0.00
0.00 + -0.75x2 + x4 = 0 + -20.25
-0.75x2 + x4 = 0 + -20.25

Combine like terms: 0 + -20.25 = -20.25
-0.75x2 + x4 = -20.25

The x term is -0.75x2.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x2 + 0.140625 + x4 = -20.25 + 0.140625

Reorder the terms:
0.140625 + -0.75x2 + x4 = -20.25 + 0.140625

Combine like terms: -20.25 + 0.140625 = -20.109375
0.140625 + -0.75x2 + x4 = -20.109375

Factor a perfect square on the left side:
(x2 + -0.375)(x2 + -0.375) = -20.109375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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