2y^2+3=8y

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Solution for 2y^2+3=8y equation:


Simplifying
2y2 + 3 = 8y

Reorder the terms:
3 + 2y2 = 8y

Solving
3 + 2y2 = 8y

Solving for variable 'y'.

Reorder the terms:
3 + -8y + 2y2 = 8y + -8y

Combine like terms: 8y + -8y = 0
3 + -8y + 2y2 = 0

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

Divide each side by '2'.
1.5 + -4y + y2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + -4y + -1.5 + y2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + -4y + y2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + -4y + y2 = 0 + -1.5
-4y + y2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
-4y + y2 = -1.5

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = -1.5 + 4

Reorder the terms:
4 + -4y + y2 = -1.5 + 4

Combine like terms: -1.5 + 4 = 2.5
4 + -4y + y2 = 2.5

Factor a perfect square on the left side:
(y + -2)(y + -2) = 2.5

Calculate the square root of the right side: 1.58113883

Break this problem into two subproblems by setting 
(y + -2) equal to 1.58113883 and -1.58113883.

Subproblem 1

y + -2 = 1.58113883 Simplifying y + -2 = 1.58113883 Reorder the terms: -2 + y = 1.58113883 Solving -2 + y = 1.58113883 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 1.58113883 + 2 Combine like terms: -2 + 2 = 0 0 + y = 1.58113883 + 2 y = 1.58113883 + 2 Combine like terms: 1.58113883 + 2 = 3.58113883 y = 3.58113883 Simplifying y = 3.58113883

Subproblem 2

y + -2 = -1.58113883 Simplifying y + -2 = -1.58113883 Reorder the terms: -2 + y = -1.58113883 Solving -2 + y = -1.58113883 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -1.58113883 + 2 Combine like terms: -2 + 2 = 0 0 + y = -1.58113883 + 2 y = -1.58113883 + 2 Combine like terms: -1.58113883 + 2 = 0.41886117 y = 0.41886117 Simplifying y = 0.41886117

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.58113883, 0.41886117}

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