y^2-1.25y+.390625=0

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Solution for y^2-1.25y+.390625=0 equation:


Simplifying
y2 + -1.25y + 0.390625 = 0

Reorder the terms:
0.390625 + -1.25y + y2 = 0

Solving
0.390625 + -1.25y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-0.390625' to each side of the equation.
0.390625 + -1.25y + -0.390625 + y2 = 0 + -0.390625

Reorder the terms:
0.390625 + -0.390625 + -1.25y + y2 = 0 + -0.390625

Combine like terms: 0.390625 + -0.390625 = 0.000000
0.000000 + -1.25y + y2 = 0 + -0.390625
-1.25y + y2 = 0 + -0.390625

Combine like terms: 0 + -0.390625 = -0.390625
-1.25y + y2 = -0.390625

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 = -0.390625 + 0.390625

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

Combine like terms: -0.390625 + 0.390625 = 0.000000
0.390625 + -1.25y + y2 = 0.000000

Factor a perfect square on the left side:
(y + -0.625)(y + -0.625) = 0.000000

Calculate the square root of the right side: 0.000000

Break this problem into two subproblems by setting 
(y + -0.625) equal to 0.000000 and 0.000000.

Subproblem 1

y + -0.625 = 0.000000 Simplifying y + -0.625 = 0.000000 Reorder the terms: -0.625 + y = 0.000000 Solving -0.625 + y = 0.000000 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 = 0.000000 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + y = 0.000000 + 0.625 y = 0.000000 + 0.625 Combine like terms: 0.000000 + 0.625 = 0.625 y = 0.625 Simplifying y = 0.625

Subproblem 2

y + -0.625 = 0.000000 Simplifying y + -0.625 = 0.000000 Reorder the terms: -0.625 + y = 0.000000 Solving -0.625 + y = 0.000000 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 = 0.000000 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + y = 0.000000 + 0.625 y = 0.000000 + 0.625 Combine like terms: 0.000000 + 0.625 = 0.625 y = 0.625 Simplifying y = 0.625

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.625, 0.625}

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