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

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


Simplifying
7x4 + -3x2 + -2 = 0

Reorder the terms:
-2 + -3x2 + 7x4 = 0

Solving
-2 + -3x2 + 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'.
-0.2857142857 + -0.4285714286x2 + x4 = 0

Move the constant term to the right:

Add '0.2857142857' to each side of the equation.
-0.2857142857 + -0.4285714286x2 + 0.2857142857 + x4 = 0 + 0.2857142857

Reorder the terms:
-0.2857142857 + 0.2857142857 + -0.4285714286x2 + x4 = 0 + 0.2857142857

Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000
0.0000000000 + -0.4285714286x2 + x4 = 0 + 0.2857142857
-0.4285714286x2 + x4 = 0 + 0.2857142857

Combine like terms: 0 + 0.2857142857 = 0.2857142857
-0.4285714286x2 + x4 = 0.2857142857

The x term is -0.4285714286x2.  Take half its coefficient (-0.2142857143).
Square it (0.04591836735) and add it to both sides.

Add '0.04591836735' to each side of the equation.
-0.4285714286x2 + 0.04591836735 + x4 = 0.2857142857 + 0.04591836735

Reorder the terms:
0.04591836735 + -0.4285714286x2 + x4 = 0.2857142857 + 0.04591836735

Combine like terms: 0.2857142857 + 0.04591836735 = 0.33163265305
0.04591836735 + -0.4285714286x2 + x4 = 0.33163265305

Factor a perfect square on the left side:
(x2 + -0.2142857143)(x2 + -0.2142857143) = 0.33163265305

Calculate the square root of the right side: 0.575875553

Break this problem into two subproblems by setting 
(x2 + -0.2142857143) equal to 0.575875553 and -0.575875553.

Subproblem 1

x2 + -0.2142857143 = 0.575875553 Simplifying x2 + -0.2142857143 = 0.575875553 Reorder the terms: -0.2142857143 + x2 = 0.575875553 Solving -0.2142857143 + x2 = 0.575875553 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2142857143' to each side of the equation. -0.2142857143 + 0.2142857143 + x2 = 0.575875553 + 0.2142857143 Combine like terms: -0.2142857143 + 0.2142857143 = 0.0000000000 0.0000000000 + x2 = 0.575875553 + 0.2142857143 x2 = 0.575875553 + 0.2142857143 Combine like terms: 0.575875553 + 0.2142857143 = 0.7901612673 x2 = 0.7901612673 Simplifying x2 = 0.7901612673 Take the square root of each side: x = {-0.888910157, 0.888910157}

Subproblem 2

x2 + -0.2142857143 = -0.575875553 Simplifying x2 + -0.2142857143 = -0.575875553 Reorder the terms: -0.2142857143 + x2 = -0.575875553 Solving -0.2142857143 + x2 = -0.575875553 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2142857143' to each side of the equation. -0.2142857143 + 0.2142857143 + x2 = -0.575875553 + 0.2142857143 Combine like terms: -0.2142857143 + 0.2142857143 = 0.0000000000 0.0000000000 + x2 = -0.575875553 + 0.2142857143 x2 = -0.575875553 + 0.2142857143 Combine like terms: -0.575875553 + 0.2142857143 = -0.3615898387 x2 = -0.3615898387 Simplifying x2 = -0.3615898387 Reorder the terms: 0.3615898387 + x2 = -0.3615898387 + 0.3615898387 Combine like terms: -0.3615898387 + 0.3615898387 = 0.0000000000 0.3615898387 + x2 = 0.0000000000 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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