2y^2-4y=3

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Solution for 2y^2-4y=3 equation:


Simplifying
2y2 + -4y = 3

Reorder the terms:
-4y + 2y2 = 3

Solving
-4y + 2y2 = 3

Solving for variable 'y'.

Reorder the terms:
-3 + -4y + 2y2 = 3 + -3

Combine like terms: 3 + -3 = 0
-3 + -4y + 2y2 = 0

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

Divide each side by '2'.
-1.5 + -2y + y2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -2y + 1.5 + y2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -2y + y2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -2y + y2 = 0 + 1.5
-2y + y2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-2y + y2 = 1.5

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = 1.5 + 1

Reorder the terms:
1 + -2y + y2 = 1.5 + 1

Combine like terms: 1.5 + 1 = 2.5
1 + -2y + y2 = 2.5

Factor a perfect square on the left side:
(y + -1)(y + -1) = 2.5

Calculate the square root of the right side: 1.58113883

Break this problem into two subproblems by setting 
(y + -1) equal to 1.58113883 and -1.58113883.

Subproblem 1

y + -1 = 1.58113883 Simplifying y + -1 = 1.58113883 Reorder the terms: -1 + y = 1.58113883 Solving -1 + y = 1.58113883 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = 1.58113883 + 1 Combine like terms: -1 + 1 = 0 0 + y = 1.58113883 + 1 y = 1.58113883 + 1 Combine like terms: 1.58113883 + 1 = 2.58113883 y = 2.58113883 Simplifying y = 2.58113883

Subproblem 2

y + -1 = -1.58113883 Simplifying y + -1 = -1.58113883 Reorder the terms: -1 + y = -1.58113883 Solving -1 + y = -1.58113883 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = -1.58113883 + 1 Combine like terms: -1 + 1 = 0 0 + y = -1.58113883 + 1 y = -1.58113883 + 1 Combine like terms: -1.58113883 + 1 = -0.58113883 y = -0.58113883 Simplifying y = -0.58113883

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.58113883, -0.58113883}

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