-4y^2+23y+15=0

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Solution for -4y^2+23y+15=0 equation:


Simplifying
-4y2 + 23y + 15 = 0

Reorder the terms:
15 + 23y + -4y2 = 0

Solving
15 + 23y + -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'.
-3.75 + -5.75y + y2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -5.75y + 3.75 + y2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -5.75y + y2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -5.75y + y2 = 0 + 3.75
-5.75y + y2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-5.75y + y2 = 3.75

The y term is -5.75y.  Take half its coefficient (-2.875).
Square it (8.265625) and add it to both sides.

Add '8.265625' to each side of the equation.
-5.75y + 8.265625 + y2 = 3.75 + 8.265625

Reorder the terms:
8.265625 + -5.75y + y2 = 3.75 + 8.265625

Combine like terms: 3.75 + 8.265625 = 12.015625
8.265625 + -5.75y + y2 = 12.015625

Factor a perfect square on the left side:
(y + -2.875)(y + -2.875) = 12.015625

Calculate the square root of the right side: 3.466356156

Break this problem into two subproblems by setting 
(y + -2.875) equal to 3.466356156 and -3.466356156.

Subproblem 1

y + -2.875 = 3.466356156 Simplifying y + -2.875 = 3.466356156 Reorder the terms: -2.875 + y = 3.466356156 Solving -2.875 + y = 3.466356156 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + y = 3.466356156 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + y = 3.466356156 + 2.875 y = 3.466356156 + 2.875 Combine like terms: 3.466356156 + 2.875 = 6.341356156 y = 6.341356156 Simplifying y = 6.341356156

Subproblem 2

y + -2.875 = -3.466356156 Simplifying y + -2.875 = -3.466356156 Reorder the terms: -2.875 + y = -3.466356156 Solving -2.875 + y = -3.466356156 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + y = -3.466356156 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + y = -3.466356156 + 2.875 y = -3.466356156 + 2.875 Combine like terms: -3.466356156 + 2.875 = -0.591356156 y = -0.591356156 Simplifying y = -0.591356156

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.341356156, -0.591356156}

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