0.4y^2=2y-2.5

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Solution for 0.4y^2=2y-2.5 equation:


Simplifying
0.4y2 = 2y + -2.5

Reorder the terms:
0.4y2 = -2.5 + 2y

Solving
0.4y2 = -2.5 + 2y

Solving for variable 'y'.

Reorder the terms:
2.5 + -2y + 0.4y2 = -2.5 + 2y + 2.5 + -2y

Reorder the terms:
2.5 + -2y + 0.4y2 = -2.5 + 2.5 + 2y + -2y

Combine like terms: -2.5 + 2.5 = 0.0
2.5 + -2y + 0.4y2 = 0.0 + 2y + -2y
2.5 + -2y + 0.4y2 = 2y + -2y

Combine like terms: 2y + -2y = 0
2.5 + -2y + 0.4y2 = 0

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

Divide each side by '0.4'.
6.25 + -5y + y2 = 0

Move the constant term to the right:

Add '-6.25' to each side of the equation.
6.25 + -5y + -6.25 + y2 = 0 + -6.25

Reorder the terms:
6.25 + -6.25 + -5y + y2 = 0 + -6.25

Combine like terms: 6.25 + -6.25 = 0.00
0.00 + -5y + y2 = 0 + -6.25
-5y + y2 = 0 + -6.25

Combine like terms: 0 + -6.25 = -6.25
-5y + y2 = -6.25

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = -6.25 + 6.25

Reorder the terms:
6.25 + -5y + y2 = -6.25 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
6.25 + -5y + y2 = 0.00

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 0.00

Calculate the square root of the right side: 0.00

Break this problem into two subproblems by setting 
(y + -2.5) equal to 0.00 and 0.00.

Subproblem 1

y + -2.5 = 0.00 Simplifying y + -2.5 = 0.00 Reorder the terms: -2.5 + y = 0.00 Solving -2.5 + y = 0.00 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 0.00 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 0.00 + 2.5 y = 0.00 + 2.5 Combine like terms: 0.00 + 2.5 = 2.5 y = 2.5 Simplifying y = 2.5

Subproblem 2

y + -2.5 = 0.00 Simplifying y + -2.5 = 0.00 Reorder the terms: -2.5 + y = 0.00 Solving -2.5 + y = 0.00 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 0.00 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 0.00 + 2.5 y = 0.00 + 2.5 Combine like terms: 0.00 + 2.5 = 2.5 y = 2.5 Simplifying y = 2.5

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.5, 2.5}

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