9x^4-25x^2=16

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Solution for 9x^4-25x^2=16 equation:


Simplifying
9x4 + -25x2 = 16

Reorder the terms:
-25x2 + 9x4 = 16

Solving
-25x2 + 9x4 = 16

Solving for variable 'x'.

Reorder the terms:
-16 + -25x2 + 9x4 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + -25x2 + 9x4 = 0

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

Divide each side by '9'.
-1.777777778 + -2.777777778x2 + x4 = 0

Move the constant term to the right:

Add '1.777777778' to each side of the equation.
-1.777777778 + -2.777777778x2 + 1.777777778 + x4 = 0 + 1.777777778

Reorder the terms:
-1.777777778 + 1.777777778 + -2.777777778x2 + x4 = 0 + 1.777777778

Combine like terms: -1.777777778 + 1.777777778 = 0.000000000
0.000000000 + -2.777777778x2 + x4 = 0 + 1.777777778
-2.777777778x2 + x4 = 0 + 1.777777778

Combine like terms: 0 + 1.777777778 = 1.777777778
-2.777777778x2 + x4 = 1.777777778

The x term is -2.777777778x2.  Take half its coefficient (-1.388888889).
Square it (1.929012346) and add it to both sides.

Add '1.929012346' to each side of the equation.
-2.777777778x2 + 1.929012346 + x4 = 1.777777778 + 1.929012346

Reorder the terms:
1.929012346 + -2.777777778x2 + x4 = 1.777777778 + 1.929012346

Combine like terms: 1.777777778 + 1.929012346 = 3.706790124
1.929012346 + -2.777777778x2 + x4 = 3.706790124

Factor a perfect square on the left side:
(x2 + -1.388888889)(x2 + -1.388888889) = 3.706790124

Calculate the square root of the right side: 1.925302606

Break this problem into two subproblems by setting 
(x2 + -1.388888889) equal to 1.925302606 and -1.925302606.

Subproblem 1

x2 + -1.388888889 = 1.925302606 Simplifying x2 + -1.388888889 = 1.925302606 Reorder the terms: -1.388888889 + x2 = 1.925302606 Solving -1.388888889 + x2 = 1.925302606 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.388888889' to each side of the equation. -1.388888889 + 1.388888889 + x2 = 1.925302606 + 1.388888889 Combine like terms: -1.388888889 + 1.388888889 = 0.000000000 0.000000000 + x2 = 1.925302606 + 1.388888889 x2 = 1.925302606 + 1.388888889 Combine like terms: 1.925302606 + 1.388888889 = 3.314191495 x2 = 3.314191495 Simplifying x2 = 3.314191495 Take the square root of each side: x = {-1.820492102, 1.820492102}

Subproblem 2

x2 + -1.388888889 = -1.925302606 Simplifying x2 + -1.388888889 = -1.925302606 Reorder the terms: -1.388888889 + x2 = -1.925302606 Solving -1.388888889 + x2 = -1.925302606 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.388888889' to each side of the equation. -1.388888889 + 1.388888889 + x2 = -1.925302606 + 1.388888889 Combine like terms: -1.388888889 + 1.388888889 = 0.000000000 0.000000000 + x2 = -1.925302606 + 1.388888889 x2 = -1.925302606 + 1.388888889 Combine like terms: -1.925302606 + 1.388888889 = -0.536413717 x2 = -0.536413717 Simplifying x2 = -0.536413717 Reorder the terms: 0.536413717 + x2 = -0.536413717 + 0.536413717 Combine like terms: -0.536413717 + 0.536413717 = 0.000000000 0.536413717 + 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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