8x^2+x^4-400=0

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Solution for 8x^2+x^4-400=0 equation:


Simplifying
8x2 + x4 + -400 = 0

Reorder the terms:
-400 + 8x2 + x4 = 0

Solving
-400 + 8x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + 8x2 + 400 + x4 = 0 + 400

Reorder the terms:
-400 + 400 + 8x2 + x4 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 8x2 + x4 = 0 + 400
8x2 + x4 = 0 + 400

Combine like terms: 0 + 400 = 400
8x2 + x4 = 400

The x term is 8x2.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x2 + 16 + x4 = 400 + 16

Reorder the terms:
16 + 8x2 + x4 = 400 + 16

Combine like terms: 400 + 16 = 416
16 + 8x2 + x4 = 416

Factor a perfect square on the left side:
(x2 + 4)(x2 + 4) = 416

Calculate the square root of the right side: 20.396078054

Break this problem into two subproblems by setting 
(x2 + 4) equal to 20.396078054 and -20.396078054.

Subproblem 1

x2 + 4 = 20.396078054 Simplifying x2 + 4 = 20.396078054 Reorder the terms: 4 + x2 = 20.396078054 Solving 4 + x2 = 20.396078054 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x2 = 20.396078054 + -4 Combine like terms: 4 + -4 = 0 0 + x2 = 20.396078054 + -4 x2 = 20.396078054 + -4 Combine like terms: 20.396078054 + -4 = 16.396078054 x2 = 16.396078054 Simplifying x2 = 16.396078054 Take the square root of each side: x = {-4.04920709, 4.04920709}

Subproblem 2

x2 + 4 = -20.396078054 Simplifying x2 + 4 = -20.396078054 Reorder the terms: 4 + x2 = -20.396078054 Solving 4 + x2 = -20.396078054 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x2 = -20.396078054 + -4 Combine like terms: 4 + -4 = 0 0 + x2 = -20.396078054 + -4 x2 = -20.396078054 + -4 Combine like terms: -20.396078054 + -4 = -24.396078054 x2 = -24.396078054 Simplifying x2 = -24.396078054 Reorder the terms: 24.396078054 + x2 = -24.396078054 + 24.396078054 Combine like terms: -24.396078054 + 24.396078054 = 0.000000000 24.396078054 + 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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