x^4-18x^2+34=0

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Solution for x^4-18x^2+34=0 equation:


Simplifying
x4 + -18x2 + 34 = 0

Reorder the terms:
34 + -18x2 + x4 = 0

Solving
34 + -18x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-34' to each side of the equation.
34 + -18x2 + -34 + x4 = 0 + -34

Reorder the terms:
34 + -34 + -18x2 + x4 = 0 + -34

Combine like terms: 34 + -34 = 0
0 + -18x2 + x4 = 0 + -34
-18x2 + x4 = 0 + -34

Combine like terms: 0 + -34 = -34
-18x2 + x4 = -34

The x term is -18x2.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x2 + 81 + x4 = -34 + 81

Reorder the terms:
81 + -18x2 + x4 = -34 + 81

Combine like terms: -34 + 81 = 47
81 + -18x2 + x4 = 47

Factor a perfect square on the left side:
(x2 + -9)(x2 + -9) = 47

Calculate the square root of the right side: 6.8556546

Break this problem into two subproblems by setting 
(x2 + -9) equal to 6.8556546 and -6.8556546.

Subproblem 1

x2 + -9 = 6.8556546 Simplifying x2 + -9 = 6.8556546 Reorder the terms: -9 + x2 = 6.8556546 Solving -9 + x2 = 6.8556546 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x2 = 6.8556546 + 9 Combine like terms: -9 + 9 = 0 0 + x2 = 6.8556546 + 9 x2 = 6.8556546 + 9 Combine like terms: 6.8556546 + 9 = 15.8556546 x2 = 15.8556546 Simplifying x2 = 15.8556546 Take the square root of each side: x = {-3.981915946, 3.981915946}

Subproblem 2

x2 + -9 = -6.8556546 Simplifying x2 + -9 = -6.8556546 Reorder the terms: -9 + x2 = -6.8556546 Solving -9 + x2 = -6.8556546 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x2 = -6.8556546 + 9 Combine like terms: -9 + 9 = 0 0 + x2 = -6.8556546 + 9 x2 = -6.8556546 + 9 Combine like terms: -6.8556546 + 9 = 2.1443454 x2 = 2.1443454 Simplifying x2 = 2.1443454 Take the square root of each side: x = {-1.464358358, 1.464358358}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.981915946, 3.981915946, -1.464358358, 1.464358358}

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