3x^4-33x^2+56=0

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Solution for 3x^4-33x^2+56=0 equation:


Simplifying
3x4 + -33x2 + 56 = 0

Reorder the terms:
56 + -33x2 + 3x4 = 0

Solving
56 + -33x2 + 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'.
18.66666667 + -11x2 + x4 = 0

Move the constant term to the right:

Add '-18.66666667' to each side of the equation.
18.66666667 + -11x2 + -18.66666667 + x4 = 0 + -18.66666667

Reorder the terms:
18.66666667 + -18.66666667 + -11x2 + x4 = 0 + -18.66666667

Combine like terms: 18.66666667 + -18.66666667 = 0.00000000
0.00000000 + -11x2 + x4 = 0 + -18.66666667
-11x2 + x4 = 0 + -18.66666667

Combine like terms: 0 + -18.66666667 = -18.66666667
-11x2 + x4 = -18.66666667

The x term is -11x2.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11x2 + 30.25 + x4 = -18.66666667 + 30.25

Reorder the terms:
30.25 + -11x2 + x4 = -18.66666667 + 30.25

Combine like terms: -18.66666667 + 30.25 = 11.58333333
30.25 + -11x2 + x4 = 11.58333333

Factor a perfect square on the left side:
(x2 + -5.5)(x2 + -5.5) = 11.58333333

Calculate the square root of the right side: 3.403429642

Break this problem into two subproblems by setting 
(x2 + -5.5) equal to 3.403429642 and -3.403429642.

Subproblem 1

x2 + -5.5 = 3.403429642 Simplifying x2 + -5.5 = 3.403429642 Reorder the terms: -5.5 + x2 = 3.403429642 Solving -5.5 + x2 = 3.403429642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x2 = 3.403429642 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x2 = 3.403429642 + 5.5 x2 = 3.403429642 + 5.5 Combine like terms: 3.403429642 + 5.5 = 8.903429642 x2 = 8.903429642 Simplifying x2 = 8.903429642 Take the square root of each side: x = {-2.983861532, 2.983861532}

Subproblem 2

x2 + -5.5 = -3.403429642 Simplifying x2 + -5.5 = -3.403429642 Reorder the terms: -5.5 + x2 = -3.403429642 Solving -5.5 + x2 = -3.403429642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x2 = -3.403429642 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x2 = -3.403429642 + 5.5 x2 = -3.403429642 + 5.5 Combine like terms: -3.403429642 + 5.5 = 2.096570358 x2 = 2.096570358 Simplifying x2 = 2.096570358 Take the square root of each side: x = {-1.447953852, 1.447953852}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.983861532, 2.983861532, -1.447953852, 1.447953852}

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