(25x^4-9x^2-36)=0

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Solution for (25x^4-9x^2-36)=0 equation:


Simplifying
(25x4 + -9x2 + -36) = 0

Reorder the terms:
(-36 + -9x2 + 25x4) = 0

Remove parenthesis around (-36 + -9x2 + 25x4)
-36 + -9x2 + 25x4 = 0

Solving
-36 + -9x2 + 25x4 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
-1.44 + -0.36x2 + x4 = 0

Move the constant term to the right:

Add '1.44' to each side of the equation.
-1.44 + -0.36x2 + 1.44 + x4 = 0 + 1.44

Reorder the terms:
-1.44 + 1.44 + -0.36x2 + x4 = 0 + 1.44

Combine like terms: -1.44 + 1.44 = 0.00
0.00 + -0.36x2 + x4 = 0 + 1.44
-0.36x2 + x4 = 0 + 1.44

Combine like terms: 0 + 1.44 = 1.44
-0.36x2 + x4 = 1.44

The x term is -0.36x2.  Take half its coefficient (-0.18).
Square it (0.0324) and add it to both sides.

Add '0.0324' to each side of the equation.
-0.36x2 + 0.0324 + x4 = 1.44 + 0.0324

Reorder the terms:
0.0324 + -0.36x2 + x4 = 1.44 + 0.0324

Combine like terms: 1.44 + 0.0324 = 1.4724
0.0324 + -0.36x2 + x4 = 1.4724

Factor a perfect square on the left side:
(x2 + -0.18)(x2 + -0.18) = 1.4724

Calculate the square root of the right side: 1.213424905

Break this problem into two subproblems by setting 
(x2 + -0.18) equal to 1.213424905 and -1.213424905.

Subproblem 1

x2 + -0.18 = 1.213424905 Simplifying x2 + -0.18 = 1.213424905 Reorder the terms: -0.18 + x2 = 1.213424905 Solving -0.18 + x2 = 1.213424905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.18' to each side of the equation. -0.18 + 0.18 + x2 = 1.213424905 + 0.18 Combine like terms: -0.18 + 0.18 = 0.00 0.00 + x2 = 1.213424905 + 0.18 x2 = 1.213424905 + 0.18 Combine like terms: 1.213424905 + 0.18 = 1.393424905 x2 = 1.393424905 Simplifying x2 = 1.393424905 Take the square root of each side: x = {-1.180434202, 1.180434202}

Subproblem 2

x2 + -0.18 = -1.213424905 Simplifying x2 + -0.18 = -1.213424905 Reorder the terms: -0.18 + x2 = -1.213424905 Solving -0.18 + x2 = -1.213424905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.18' to each side of the equation. -0.18 + 0.18 + x2 = -1.213424905 + 0.18 Combine like terms: -0.18 + 0.18 = 0.00 0.00 + x2 = -1.213424905 + 0.18 x2 = -1.213424905 + 0.18 Combine like terms: -1.213424905 + 0.18 = -1.033424905 x2 = -1.033424905 Simplifying x2 = -1.033424905 Reorder the terms: 1.033424905 + x2 = -1.033424905 + 1.033424905 Combine like terms: -1.033424905 + 1.033424905 = 0.000000000 1.033424905 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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