16x^4-9x^2=6

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Solution for 16x^4-9x^2=6 equation:


Simplifying
16x4 + -9x2 = 6

Reorder the terms:
-9x2 + 16x4 = 6

Solving
-9x2 + 16x4 = 6

Solving for variable 'x'.

Reorder the terms:
-6 + -9x2 + 16x4 = 6 + -6

Combine like terms: 6 + -6 = 0
-6 + -9x2 + 16x4 = 0

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

Divide each side by '16'.
-0.375 + -0.5625x2 + x4 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -0.5625x2 + 0.375 + x4 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -0.5625x2 + x4 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -0.5625x2 + x4 = 0 + 0.375
-0.5625x2 + x4 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-0.5625x2 + x4 = 0.375

The x term is -0.5625x2.  Take half its coefficient (-0.28125).
Square it (0.0791015625) and add it to both sides.

Add '0.0791015625' to each side of the equation.
-0.5625x2 + 0.0791015625 + x4 = 0.375 + 0.0791015625

Reorder the terms:
0.0791015625 + -0.5625x2 + x4 = 0.375 + 0.0791015625

Combine like terms: 0.375 + 0.0791015625 = 0.4541015625
0.0791015625 + -0.5625x2 + x4 = 0.4541015625

Factor a perfect square on the left side:
(x2 + -0.28125)(x2 + -0.28125) = 0.4541015625

Calculate the square root of the right side: 0.673870583

Break this problem into two subproblems by setting 
(x2 + -0.28125) equal to 0.673870583 and -0.673870583.

Subproblem 1

x2 + -0.28125 = 0.673870583 Simplifying x2 + -0.28125 = 0.673870583 Reorder the terms: -0.28125 + x2 = 0.673870583 Solving -0.28125 + x2 = 0.673870583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.28125' to each side of the equation. -0.28125 + 0.28125 + x2 = 0.673870583 + 0.28125 Combine like terms: -0.28125 + 0.28125 = 0.00000 0.00000 + x2 = 0.673870583 + 0.28125 x2 = 0.673870583 + 0.28125 Combine like terms: 0.673870583 + 0.28125 = 0.955120583 x2 = 0.955120583 Simplifying x2 = 0.955120583 Take the square root of each side: x = {-0.977302708, 0.977302708}

Subproblem 2

x2 + -0.28125 = -0.673870583 Simplifying x2 + -0.28125 = -0.673870583 Reorder the terms: -0.28125 + x2 = -0.673870583 Solving -0.28125 + x2 = -0.673870583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.28125' to each side of the equation. -0.28125 + 0.28125 + x2 = -0.673870583 + 0.28125 Combine like terms: -0.28125 + 0.28125 = 0.00000 0.00000 + x2 = -0.673870583 + 0.28125 x2 = -0.673870583 + 0.28125 Combine like terms: -0.673870583 + 0.28125 = -0.392620583 x2 = -0.392620583 Simplifying x2 = -0.392620583 Reorder the terms: 0.392620583 + x2 = -0.392620583 + 0.392620583 Combine like terms: -0.392620583 + 0.392620583 = 0.000000000 0.392620583 + 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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