x^4-30x^2+124=0

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Solution for x^4-30x^2+124=0 equation:


Simplifying
x4 + -30x2 + 124 = 0

Reorder the terms:
124 + -30x2 + x4 = 0

Solving
124 + -30x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-124' to each side of the equation.
124 + -30x2 + -124 + x4 = 0 + -124

Reorder the terms:
124 + -124 + -30x2 + x4 = 0 + -124

Combine like terms: 124 + -124 = 0
0 + -30x2 + x4 = 0 + -124
-30x2 + x4 = 0 + -124

Combine like terms: 0 + -124 = -124
-30x2 + x4 = -124

The x term is -30x2.  Take half its coefficient (-15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
-30x2 + 225 + x4 = -124 + 225

Reorder the terms:
225 + -30x2 + x4 = -124 + 225

Combine like terms: -124 + 225 = 101
225 + -30x2 + x4 = 101

Factor a perfect square on the left side:
(x2 + -15)(x2 + -15) = 101

Calculate the square root of the right side: 10.049875621

Break this problem into two subproblems by setting 
(x2 + -15) equal to 10.049875621 and -10.049875621.

Subproblem 1

x2 + -15 = 10.049875621 Simplifying x2 + -15 = 10.049875621 Reorder the terms: -15 + x2 = 10.049875621 Solving -15 + x2 = 10.049875621 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + x2 = 10.049875621 + 15 Combine like terms: -15 + 15 = 0 0 + x2 = 10.049875621 + 15 x2 = 10.049875621 + 15 Combine like terms: 10.049875621 + 15 = 25.049875621 x2 = 25.049875621 Simplifying x2 = 25.049875621 Take the square root of each side: x = {-5.004985077, 5.004985077}

Subproblem 2

x2 + -15 = -10.049875621 Simplifying x2 + -15 = -10.049875621 Reorder the terms: -15 + x2 = -10.049875621 Solving -15 + x2 = -10.049875621 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + x2 = -10.049875621 + 15 Combine like terms: -15 + 15 = 0 0 + x2 = -10.049875621 + 15 x2 = -10.049875621 + 15 Combine like terms: -10.049875621 + 15 = 4.950124379 x2 = 4.950124379 Simplifying x2 = 4.950124379 Take the square root of each side: x = {-2.224887498, 2.224887498}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-5.004985077, 5.004985077, -2.224887498, 2.224887498}

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