x^4-16x^2+49=0

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Solution for x^4-16x^2+49=0 equation:


Simplifying
x4 + -16x2 + 49 = 0

Reorder the terms:
49 + -16x2 + x4 = 0

Solving
49 + -16x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-49' to each side of the equation.
49 + -16x2 + -49 + x4 = 0 + -49

Reorder the terms:
49 + -49 + -16x2 + x4 = 0 + -49

Combine like terms: 49 + -49 = 0
0 + -16x2 + x4 = 0 + -49
-16x2 + x4 = 0 + -49

Combine like terms: 0 + -49 = -49
-16x2 + x4 = -49

The x term is -16x2.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x2 + 64 + x4 = -49 + 64

Reorder the terms:
64 + -16x2 + x4 = -49 + 64

Combine like terms: -49 + 64 = 15
64 + -16x2 + x4 = 15

Factor a perfect square on the left side:
(x2 + -8)(x2 + -8) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x2 + -8) equal to 3.872983346 and -3.872983346.

Subproblem 1

x2 + -8 = 3.872983346 Simplifying x2 + -8 = 3.872983346 Reorder the terms: -8 + x2 = 3.872983346 Solving -8 + x2 = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x2 = 3.872983346 + 8 Combine like terms: -8 + 8 = 0 0 + x2 = 3.872983346 + 8 x2 = 3.872983346 + 8 Combine like terms: 3.872983346 + 8 = 11.872983346 x2 = 11.872983346 Simplifying x2 = 11.872983346 Take the square root of each side: x = {-3.445719569, 3.445719569}

Subproblem 2

x2 + -8 = -3.872983346 Simplifying x2 + -8 = -3.872983346 Reorder the terms: -8 + x2 = -3.872983346 Solving -8 + x2 = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x2 = -3.872983346 + 8 Combine like terms: -8 + 8 = 0 0 + x2 = -3.872983346 + 8 x2 = -3.872983346 + 8 Combine like terms: -3.872983346 + 8 = 4.127016654 x2 = 4.127016654 Simplifying x2 = 4.127016654 Take the square root of each side: x = {-2.031506006, 2.031506006}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.445719569, 3.445719569, -2.031506006, 2.031506006}

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