4x^4-9x^2+36=0

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Solution for 4x^4-9x^2+36=0 equation:


Simplifying
4x4 + -9x2 + 36 = 0

Reorder the terms:
36 + -9x2 + 4x4 = 0

Solving
36 + -9x2 + 4x4 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
9 + -2.25x2 + x4 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -2.25x2 + -9 + x4 = 0 + -9

Reorder the terms:
9 + -9 + -2.25x2 + x4 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -2.25x2 + x4 = 0 + -9
-2.25x2 + x4 = 0 + -9

Combine like terms: 0 + -9 = -9
-2.25x2 + x4 = -9

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 = -9 + 1.265625

Reorder the terms:
1.265625 + -2.25x2 + x4 = -9 + 1.265625

Combine like terms: -9 + 1.265625 = -7.734375
1.265625 + -2.25x2 + x4 = -7.734375

Factor a perfect square on the left side:
(x2 + -1.125)(x2 + -1.125) = -7.734375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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