5y^4-14y^2+3=0

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Solution for 5y^4-14y^2+3=0 equation:


Simplifying
5y4 + -14y2 + 3 = 0

Reorder the terms:
3 + -14y2 + 5y4 = 0

Solving
3 + -14y2 + 5y4 = 0

Solving for variable 'y'.

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

Divide each side by '5'.
0.6 + -2.8y2 + y4 = 0

Move the constant term to the right:

Add '-0.6' to each side of the equation.
0.6 + -2.8y2 + -0.6 + y4 = 0 + -0.6

Reorder the terms:
0.6 + -0.6 + -2.8y2 + y4 = 0 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + -2.8y2 + y4 = 0 + -0.6
-2.8y2 + y4 = 0 + -0.6

Combine like terms: 0 + -0.6 = -0.6
-2.8y2 + y4 = -0.6

The y term is -2.8y2.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8y2 + 1.96 + y4 = -0.6 + 1.96

Reorder the terms:
1.96 + -2.8y2 + y4 = -0.6 + 1.96

Combine like terms: -0.6 + 1.96 = 1.36
1.96 + -2.8y2 + y4 = 1.36

Factor a perfect square on the left side:
(y2 + -1.4)(y2 + -1.4) = 1.36

Calculate the square root of the right side: 1.166190379

Break this problem into two subproblems by setting 
(y2 + -1.4) equal to 1.166190379 and -1.166190379.

Subproblem 1

y2 + -1.4 = 1.166190379 Simplifying y2 + -1.4 = 1.166190379 Reorder the terms: -1.4 + y2 = 1.166190379 Solving -1.4 + y2 = 1.166190379 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + y2 = 1.166190379 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + y2 = 1.166190379 + 1.4 y2 = 1.166190379 + 1.4 Combine like terms: 1.166190379 + 1.4 = 2.566190379 y2 = 2.566190379 Simplifying y2 = 2.566190379 Take the square root of each side: y = {-1.601933325, 1.601933325}

Subproblem 2

y2 + -1.4 = -1.166190379 Simplifying y2 + -1.4 = -1.166190379 Reorder the terms: -1.4 + y2 = -1.166190379 Solving -1.4 + y2 = -1.166190379 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + y2 = -1.166190379 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + y2 = -1.166190379 + 1.4 y2 = -1.166190379 + 1.4 Combine like terms: -1.166190379 + 1.4 = 0.233809621 y2 = 0.233809621 Simplifying y2 = 0.233809621 Take the square root of each side: y = {-0.483538645, 0.483538645}

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.601933325, 1.601933325, -0.483538645, 0.483538645}

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