x^4+3x^2-7=

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


Simplifying
x4 + 3x2 + -7 = 0

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

Solving
-7 + 3x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 3x2 + 7 + x4 = 0 + 7

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

Combine like terms: -7 + 7 = 0
0 + 3x2 + x4 = 0 + 7
3x2 + x4 = 0 + 7

Combine like terms: 0 + 7 = 7
3x2 + x4 = 7

The x term is 3x2.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x2 + 2.25 + x4 = 7 + 2.25

Reorder the terms:
2.25 + 3x2 + x4 = 7 + 2.25

Combine like terms: 7 + 2.25 = 9.25
2.25 + 3x2 + x4 = 9.25

Factor a perfect square on the left side:
(x2 + 1.5)(x2 + 1.5) = 9.25

Calculate the square root of the right side: 3.041381265

Break this problem into two subproblems by setting 
(x2 + 1.5) equal to 3.041381265 and -3.041381265.

Subproblem 1

x2 + 1.5 = 3.041381265 Simplifying x2 + 1.5 = 3.041381265 Reorder the terms: 1.5 + x2 = 3.041381265 Solving 1.5 + x2 = 3.041381265 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x2 = 3.041381265 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x2 = 3.041381265 + -1.5 x2 = 3.041381265 + -1.5 Combine like terms: 3.041381265 + -1.5 = 1.541381265 x2 = 1.541381265 Simplifying x2 = 1.541381265 Take the square root of each side: x = {-1.241523767, 1.241523767}

Subproblem 2

x2 + 1.5 = -3.041381265 Simplifying x2 + 1.5 = -3.041381265 Reorder the terms: 1.5 + x2 = -3.041381265 Solving 1.5 + x2 = -3.041381265 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x2 = -3.041381265 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x2 = -3.041381265 + -1.5 x2 = -3.041381265 + -1.5 Combine like terms: -3.041381265 + -1.5 = -4.541381265 x2 = -4.541381265 Simplifying x2 = -4.541381265 Reorder the terms: 4.541381265 + x2 = -4.541381265 + 4.541381265 Combine like terms: -4.541381265 + 4.541381265 = 0.000000000 4.541381265 + 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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