7x^4+16x^2-3=0

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Solution for 7x^4+16x^2-3=0 equation:


Simplifying
7x4 + 16x2 + -3 = 0

Reorder the terms:
-3 + 16x2 + 7x4 = 0

Solving
-3 + 16x2 + 7x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
7 the coefficient of the squared term: 

Divide each side by '7'.
-0.4285714286 + 2.285714286x2 + x4 = 0

Move the constant term to the right:

Add '0.4285714286' to each side of the equation.
-0.4285714286 + 2.285714286x2 + 0.4285714286 + x4 = 0 + 0.4285714286

Reorder the terms:
-0.4285714286 + 0.4285714286 + 2.285714286x2 + x4 = 0 + 0.4285714286

Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000
0.0000000000 + 2.285714286x2 + x4 = 0 + 0.4285714286
2.285714286x2 + x4 = 0 + 0.4285714286

Combine like terms: 0 + 0.4285714286 = 0.4285714286
2.285714286x2 + x4 = 0.4285714286

The x term is 2.285714286x2.  Take half its coefficient (1.142857143).
Square it (1.306122449) and add it to both sides.

Add '1.306122449' to each side of the equation.
2.285714286x2 + 1.306122449 + x4 = 0.4285714286 + 1.306122449

Reorder the terms:
1.306122449 + 2.285714286x2 + x4 = 0.4285714286 + 1.306122449

Combine like terms: 0.4285714286 + 1.306122449 = 1.7346938776
1.306122449 + 2.285714286x2 + x4 = 1.7346938776

Factor a perfect square on the left side:
(x2 + 1.142857143)(x2 + 1.142857143) = 1.7346938776

Calculate the square root of the right side: 1.31707778

Break this problem into two subproblems by setting 
(x2 + 1.142857143) equal to 1.31707778 and -1.31707778.

Subproblem 1

x2 + 1.142857143 = 1.31707778 Simplifying x2 + 1.142857143 = 1.31707778 Reorder the terms: 1.142857143 + x2 = 1.31707778 Solving 1.142857143 + x2 = 1.31707778 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.142857143' to each side of the equation. 1.142857143 + -1.142857143 + x2 = 1.31707778 + -1.142857143 Combine like terms: 1.142857143 + -1.142857143 = 0.000000000 0.000000000 + x2 = 1.31707778 + -1.142857143 x2 = 1.31707778 + -1.142857143 Combine like terms: 1.31707778 + -1.142857143 = 0.174220637 x2 = 0.174220637 Simplifying x2 = 0.174220637 Take the square root of each side: x = {-0.417397457, 0.417397457}

Subproblem 2

x2 + 1.142857143 = -1.31707778 Simplifying x2 + 1.142857143 = -1.31707778 Reorder the terms: 1.142857143 + x2 = -1.31707778 Solving 1.142857143 + x2 = -1.31707778 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.142857143' to each side of the equation. 1.142857143 + -1.142857143 + x2 = -1.31707778 + -1.142857143 Combine like terms: 1.142857143 + -1.142857143 = 0.000000000 0.000000000 + x2 = -1.31707778 + -1.142857143 x2 = -1.31707778 + -1.142857143 Combine like terms: -1.31707778 + -1.142857143 = -2.459934923 x2 = -2.459934923 Simplifying x2 = -2.459934923 Reorder the terms: 2.459934923 + x2 = -2.459934923 + 2.459934923 Combine like terms: -2.459934923 + 2.459934923 = 0.000000000 2.459934923 + 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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