3x^4+5x^2-30=0

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Solution for 3x^4+5x^2-30=0 equation:


Simplifying
3x4 + 5x2 + -30 = 0

Reorder the terms:
-30 + 5x2 + 3x4 = 0

Solving
-30 + 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'.
-10 + 1.666666667x2 + x4 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 1.666666667x2 + 10 + x4 = 0 + 10

Reorder the terms:
-10 + 10 + 1.666666667x2 + x4 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 1.666666667x2 + x4 = 0 + 10
1.666666667x2 + x4 = 0 + 10

Combine like terms: 0 + 10 = 10
1.666666667x2 + x4 = 10

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 = 10 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x2 + x4 = 10 + 0.6944444447

Combine like terms: 10 + 0.6944444447 = 10.6944444447
0.6944444447 + 1.666666667x2 + x4 = 10.6944444447

Factor a perfect square on the left side:
(x2 + 0.8333333335)(x2 + 0.8333333335) = 10.6944444447

Calculate the square root of the right side: 3.270236145

Break this problem into two subproblems by setting 
(x2 + 0.8333333335) equal to 3.270236145 and -3.270236145.

Subproblem 1

x2 + 0.8333333335 = 3.270236145 Simplifying x2 + 0.8333333335 = 3.270236145 Reorder the terms: 0.8333333335 + x2 = 3.270236145 Solving 0.8333333335 + x2 = 3.270236145 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 = 3.270236145 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x2 = 3.270236145 + -0.8333333335 x2 = 3.270236145 + -0.8333333335 Combine like terms: 3.270236145 + -0.8333333335 = 2.4369028115 x2 = 2.4369028115 Simplifying x2 = 2.4369028115 Take the square root of each side: x = {-1.561058235, 1.561058235}

Subproblem 2

x2 + 0.8333333335 = -3.270236145 Simplifying x2 + 0.8333333335 = -3.270236145 Reorder the terms: 0.8333333335 + x2 = -3.270236145 Solving 0.8333333335 + x2 = -3.270236145 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 = -3.270236145 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x2 = -3.270236145 + -0.8333333335 x2 = -3.270236145 + -0.8333333335 Combine like terms: -3.270236145 + -0.8333333335 = -4.1035694785 x2 = -4.1035694785 Simplifying x2 = -4.1035694785 Reorder the terms: 4.1035694785 + x2 = -4.1035694785 + 4.1035694785 Combine like terms: -4.1035694785 + 4.1035694785 = 0.0000000000 4.1035694785 + 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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