x^4+9x^2+16=1

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Solution for x^4+9x^2+16=1 equation:


Simplifying
x4 + 9x2 + 16 = 1

Reorder the terms:
16 + 9x2 + x4 = 1

Solving
16 + 9x2 + x4 = 1

Solving for variable 'x'.

Reorder the terms:
16 + -1 + 9x2 + x4 = 1 + -1

Combine like terms: 16 + -1 = 15
15 + 9x2 + x4 = 1 + -1

Combine like terms: 1 + -1 = 0
15 + 9x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + 9x2 + -15 + x4 = 0 + -15

Reorder the terms:
15 + -15 + 9x2 + x4 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 9x2 + x4 = 0 + -15
9x2 + x4 = 0 + -15

Combine like terms: 0 + -15 = -15
9x2 + x4 = -15

The x term is 9x2.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x2 + 20.25 + x4 = -15 + 20.25

Reorder the terms:
20.25 + 9x2 + x4 = -15 + 20.25

Combine like terms: -15 + 20.25 = 5.25
20.25 + 9x2 + x4 = 5.25

Factor a perfect square on the left side:
(x2 + 4.5)(x2 + 4.5) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(x2 + 4.5) equal to 2.291287847 and -2.291287847.

Subproblem 1

x2 + 4.5 = 2.291287847 Simplifying x2 + 4.5 = 2.291287847 Reorder the terms: 4.5 + x2 = 2.291287847 Solving 4.5 + x2 = 2.291287847 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x2 = 2.291287847 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x2 = 2.291287847 + -4.5 x2 = 2.291287847 + -4.5 Combine like terms: 2.291287847 + -4.5 = -2.208712153 x2 = -2.208712153 Simplifying x2 = -2.208712153 Reorder the terms: 2.208712153 + x2 = -2.208712153 + 2.208712153 Combine like terms: -2.208712153 + 2.208712153 = 0.000000000 2.208712153 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined.

Subproblem 2

x2 + 4.5 = -2.291287847 Simplifying x2 + 4.5 = -2.291287847 Reorder the terms: 4.5 + x2 = -2.291287847 Solving 4.5 + x2 = -2.291287847 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x2 = -2.291287847 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x2 = -2.291287847 + -4.5 x2 = -2.291287847 + -4.5 Combine like terms: -2.291287847 + -4.5 = -6.791287847 x2 = -6.791287847 Simplifying x2 = -6.791287847 Reorder the terms: 6.791287847 + x2 = -6.791287847 + 6.791287847 Combine like terms: -6.791287847 + 6.791287847 = 0.000000000 6.791287847 + 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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