3x^4-10x^2-45=0

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Solution for 3x^4-10x^2-45=0 equation:


Simplifying
3x4 + -10x2 + -45 = 0

Reorder the terms:
-45 + -10x2 + 3x4 = 0

Solving
-45 + -10x2 + 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'.
-15 + -3.333333333x2 + x4 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -3.333333333x2 + 15 + x4 = 0 + 15

Reorder the terms:
-15 + 15 + -3.333333333x2 + x4 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -3.333333333x2 + x4 = 0 + 15
-3.333333333x2 + x4 = 0 + 15

Combine like terms: 0 + 15 = 15
-3.333333333x2 + x4 = 15

The x term is -3.333333333x2.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333x2 + 2.777777779 + x4 = 15 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333x2 + x4 = 15 + 2.777777779

Combine like terms: 15 + 2.777777779 = 17.777777779
2.777777779 + -3.333333333x2 + x4 = 17.777777779

Factor a perfect square on the left side:
(x2 + -1.666666667)(x2 + -1.666666667) = 17.777777779

Calculate the square root of the right side: 4.216370214

Break this problem into two subproblems by setting 
(x2 + -1.666666667) equal to 4.216370214 and -4.216370214.

Subproblem 1

x2 + -1.666666667 = 4.216370214 Simplifying x2 + -1.666666667 = 4.216370214 Reorder the terms: -1.666666667 + x2 = 4.216370214 Solving -1.666666667 + x2 = 4.216370214 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x2 = 4.216370214 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x2 = 4.216370214 + 1.666666667 x2 = 4.216370214 + 1.666666667 Combine like terms: 4.216370214 + 1.666666667 = 5.883036881 x2 = 5.883036881 Simplifying x2 = 5.883036881 Take the square root of each side: x = {-2.425497244, 2.425497244}

Subproblem 2

x2 + -1.666666667 = -4.216370214 Simplifying x2 + -1.666666667 = -4.216370214 Reorder the terms: -1.666666667 + x2 = -4.216370214 Solving -1.666666667 + x2 = -4.216370214 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x2 = -4.216370214 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x2 = -4.216370214 + 1.666666667 x2 = -4.216370214 + 1.666666667 Combine like terms: -4.216370214 + 1.666666667 = -2.549703547 x2 = -2.549703547 Simplifying x2 = -2.549703547 Reorder the terms: 2.549703547 + x2 = -2.549703547 + 2.549703547 Combine like terms: -2.549703547 + 2.549703547 = 0.000000000 2.549703547 + 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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