4y^2-5y-25=0

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Solution for 4y^2-5y-25=0 equation:


Simplifying
4y2 + -5y + -25 = 0

Reorder the terms:
-25 + -5y + 4y2 = 0

Solving
-25 + -5y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
-6.25 + -1.25y + y2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + -1.25y + 6.25 + y2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + -1.25y + y2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + -1.25y + y2 = 0 + 6.25
-1.25y + y2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
-1.25y + y2 = 6.25

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 = 6.25 + 0.390625

Reorder the terms:
0.390625 + -1.25y + y2 = 6.25 + 0.390625

Combine like terms: 6.25 + 0.390625 = 6.640625
0.390625 + -1.25y + y2 = 6.640625

Factor a perfect square on the left side:
(y + -0.625)(y + -0.625) = 6.640625

Calculate the square root of the right side: 2.576941016

Break this problem into two subproblems by setting 
(y + -0.625) equal to 2.576941016 and -2.576941016.

Subproblem 1

y + -0.625 = 2.576941016 Simplifying y + -0.625 = 2.576941016 Reorder the terms: -0.625 + y = 2.576941016 Solving -0.625 + y = 2.576941016 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 = 2.576941016 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + y = 2.576941016 + 0.625 y = 2.576941016 + 0.625 Combine like terms: 2.576941016 + 0.625 = 3.201941016 y = 3.201941016 Simplifying y = 3.201941016

Subproblem 2

y + -0.625 = -2.576941016 Simplifying y + -0.625 = -2.576941016 Reorder the terms: -0.625 + y = -2.576941016 Solving -0.625 + y = -2.576941016 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 = -2.576941016 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + y = -2.576941016 + 0.625 y = -2.576941016 + 0.625 Combine like terms: -2.576941016 + 0.625 = -1.951941016 y = -1.951941016 Simplifying y = -1.951941016

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.201941016, -1.951941016}

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