x^4+9x^2-144=0

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Solution for x^4+9x^2-144=0 equation:


Simplifying
x4 + 9x2 + -144 = 0

Reorder the terms:
-144 + 9x2 + x4 = 0

Solving
-144 + 9x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '144' to each side of the equation.
-144 + 9x2 + 144 + x4 = 0 + 144

Reorder the terms:
-144 + 144 + 9x2 + x4 = 0 + 144

Combine like terms: -144 + 144 = 0
0 + 9x2 + x4 = 0 + 144
9x2 + x4 = 0 + 144

Combine like terms: 0 + 144 = 144
9x2 + x4 = 144

The x term is 9x2.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x2 + 20.25 + x4 = 144 + 20.25

Reorder the terms:
20.25 + 9x2 + x4 = 144 + 20.25

Combine like terms: 144 + 20.25 = 164.25
20.25 + 9x2 + x4 = 164.25

Factor a perfect square on the left side:
(x2 + 4.5)(x2 + 4.5) = 164.25

Calculate the square root of the right side: 12.816005618

Break this problem into two subproblems by setting 
(x2 + 4.5) equal to 12.816005618 and -12.816005618.

Subproblem 1

x2 + 4.5 = 12.816005618 Simplifying x2 + 4.5 = 12.816005618 Reorder the terms: 4.5 + x2 = 12.816005618 Solving 4.5 + x2 = 12.816005618 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x2 = 12.816005618 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x2 = 12.816005618 + -4.5 x2 = 12.816005618 + -4.5 Combine like terms: 12.816005618 + -4.5 = 8.316005618 x2 = 8.316005618 Simplifying x2 = 8.316005618 Take the square root of each side: x = {-2.883748536, 2.883748536}

Subproblem 2

x2 + 4.5 = -12.816005618 Simplifying x2 + 4.5 = -12.816005618 Reorder the terms: 4.5 + x2 = -12.816005618 Solving 4.5 + x2 = -12.816005618 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x2 = -12.816005618 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x2 = -12.816005618 + -4.5 x2 = -12.816005618 + -4.5 Combine like terms: -12.816005618 + -4.5 = -17.316005618 x2 = -17.316005618 Simplifying x2 = -17.316005618 Reorder the terms: 17.316005618 + x2 = -17.316005618 + 17.316005618 Combine like terms: -17.316005618 + 17.316005618 = 0.000000000 17.316005618 + 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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