-4y^2=5y-4

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Solution for -4y^2=5y-4 equation:


Simplifying
-4y2 = 5y + -4

Reorder the terms:
-4y2 = -4 + 5y

Solving
-4y2 = -4 + 5y

Solving for variable 'y'.

Reorder the terms:
4 + -5y + -4y2 = -4 + 5y + 4 + -5y

Reorder the terms:
4 + -5y + -4y2 = -4 + 4 + 5y + -5y

Combine like terms: -4 + 4 = 0
4 + -5y + -4y2 = 0 + 5y + -5y
4 + -5y + -4y2 = 5y + -5y

Combine like terms: 5y + -5y = 0
4 + -5y + -4y2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-1 + 1.25y + y2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 1.25y + 1 + y2 = 0 + 1

Reorder the terms:
-1 + 1 + 1.25y + y2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 1.25y + y2 = 0 + 1
1.25y + y2 = 0 + 1

Combine like terms: 0 + 1 = 1
1.25y + y2 = 1

The y term is 1.25y.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25y + 0.390625 + y2 = 1 + 0.390625

Reorder the terms:
0.390625 + 1.25y + y2 = 1 + 0.390625

Combine like terms: 1 + 0.390625 = 1.390625
0.390625 + 1.25y + y2 = 1.390625

Factor a perfect square on the left side:
(y + 0.625)(y + 0.625) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(y + 0.625) equal to 1.179247642 and -1.179247642.

Subproblem 1

y + 0.625 = 1.179247642 Simplifying y + 0.625 = 1.179247642 Reorder the terms: 0.625 + y = 1.179247642 Solving 0.625 + y = 1.179247642 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + y = 1.179247642 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + y = 1.179247642 + -0.625 y = 1.179247642 + -0.625 Combine like terms: 1.179247642 + -0.625 = 0.554247642 y = 0.554247642 Simplifying y = 0.554247642

Subproblem 2

y + 0.625 = -1.179247642 Simplifying y + 0.625 = -1.179247642 Reorder the terms: 0.625 + y = -1.179247642 Solving 0.625 + y = -1.179247642 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + y = -1.179247642 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + y = -1.179247642 + -0.625 y = -1.179247642 + -0.625 Combine like terms: -1.179247642 + -0.625 = -1.804247642 y = -1.804247642 Simplifying y = -1.804247642

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.554247642, -1.804247642}

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