3x^4+5x^2-72=0

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Solution for 3x^4+5x^2-72=0 equation:


Simplifying
3x4 + 5x2 + -72 = 0

Reorder the terms:
-72 + 5x2 + 3x4 = 0

Solving
-72 + 5x2 + 3x4 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-24 + 1.666666667x2 + x4 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 1.666666667x2 + 24 + x4 = 0 + 24

Reorder the terms:
-24 + 24 + 1.666666667x2 + x4 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 1.666666667x2 + x4 = 0 + 24
1.666666667x2 + x4 = 0 + 24

Combine like terms: 0 + 24 = 24
1.666666667x2 + x4 = 24

The x term is 1.666666667x2.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x2 + 0.6944444447 + x4 = 24 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x2 + x4 = 24 + 0.6944444447

Combine like terms: 24 + 0.6944444447 = 24.6944444447
0.6944444447 + 1.666666667x2 + x4 = 24.6944444447

Factor a perfect square on the left side:
(x2 + 0.8333333335)(x2 + 0.8333333335) = 24.6944444447

Calculate the square root of the right side: 4.969350505

Break this problem into two subproblems by setting 
(x2 + 0.8333333335) equal to 4.969350505 and -4.969350505.

Subproblem 1

x2 + 0.8333333335 = 4.969350505 Simplifying x2 + 0.8333333335 = 4.969350505 Reorder the terms: 0.8333333335 + x2 = 4.969350505 Solving 0.8333333335 + x2 = 4.969350505 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x2 = 4.969350505 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x2 = 4.969350505 + -0.8333333335 x2 = 4.969350505 + -0.8333333335 Combine like terms: 4.969350505 + -0.8333333335 = 4.1360171715 x2 = 4.1360171715 Simplifying x2 = 4.1360171715 Take the square root of each side: x = {-2.033720033, 2.033720033}

Subproblem 2

x2 + 0.8333333335 = -4.969350505 Simplifying x2 + 0.8333333335 = -4.969350505 Reorder the terms: 0.8333333335 + x2 = -4.969350505 Solving 0.8333333335 + x2 = -4.969350505 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x2 = -4.969350505 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x2 = -4.969350505 + -0.8333333335 x2 = -4.969350505 + -0.8333333335 Combine like terms: -4.969350505 + -0.8333333335 = -5.8026838385 x2 = -5.8026838385 Simplifying x2 = -5.8026838385 Reorder the terms: 5.8026838385 + x2 = -5.8026838385 + 5.8026838385 Combine like terms: -5.8026838385 + 5.8026838385 = 0.0000000000 5.8026838385 + x2 = 0.0000000000 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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