5x^4-3x^2=15

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Solution for 5x^4-3x^2=15 equation:


Simplifying
5x4 + -3x2 = 15

Reorder the terms:
-3x2 + 5x4 = 15

Solving
-3x2 + 5x4 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -3x2 + 5x4 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -3x2 + 5x4 = 0

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

Divide each side by '5'.
-3 + -0.6x2 + x4 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -0.6x2 + 3 + x4 = 0 + 3

Reorder the terms:
-3 + 3 + -0.6x2 + x4 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -0.6x2 + x4 = 0 + 3
-0.6x2 + x4 = 0 + 3

Combine like terms: 0 + 3 = 3
-0.6x2 + x4 = 3

The x term is -0.6x2.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x2 + 0.09 + x4 = 3 + 0.09

Reorder the terms:
0.09 + -0.6x2 + x4 = 3 + 0.09

Combine like terms: 3 + 0.09 = 3.09
0.09 + -0.6x2 + x4 = 3.09

Factor a perfect square on the left side:
(x2 + -0.3)(x2 + -0.3) = 3.09

Calculate the square root of the right side: 1.757839583

Break this problem into two subproblems by setting 
(x2 + -0.3) equal to 1.757839583 and -1.757839583.

Subproblem 1

x2 + -0.3 = 1.757839583 Simplifying x2 + -0.3 = 1.757839583 Reorder the terms: -0.3 + x2 = 1.757839583 Solving -0.3 + x2 = 1.757839583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x2 = 1.757839583 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x2 = 1.757839583 + 0.3 x2 = 1.757839583 + 0.3 Combine like terms: 1.757839583 + 0.3 = 2.057839583 x2 = 2.057839583 Simplifying x2 = 2.057839583 Take the square root of each side: x = {-1.434517195, 1.434517195}

Subproblem 2

x2 + -0.3 = -1.757839583 Simplifying x2 + -0.3 = -1.757839583 Reorder the terms: -0.3 + x2 = -1.757839583 Solving -0.3 + x2 = -1.757839583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x2 = -1.757839583 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x2 = -1.757839583 + 0.3 x2 = -1.757839583 + 0.3 Combine like terms: -1.757839583 + 0.3 = -1.457839583 x2 = -1.457839583 Simplifying x2 = -1.457839583 Reorder the terms: 1.457839583 + x2 = -1.457839583 + 1.457839583 Combine like terms: -1.457839583 + 1.457839583 = 0.000000000 1.457839583 + 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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