4y^2-15y=11

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Solution for 4y^2-15y=11 equation:


Simplifying
4y2 + -15y = 11

Reorder the terms:
-15y + 4y2 = 11

Solving
-15y + 4y2 = 11

Solving for variable 'y'.

Reorder the terms:
-11 + -15y + 4y2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + -15y + 4y2 = 0

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

Divide each side by '4'.
-2.75 + -3.75y + y2 = 0

Move the constant term to the right:

Add '2.75' to each side of the equation.
-2.75 + -3.75y + 2.75 + y2 = 0 + 2.75

Reorder the terms:
-2.75 + 2.75 + -3.75y + y2 = 0 + 2.75

Combine like terms: -2.75 + 2.75 = 0.00
0.00 + -3.75y + y2 = 0 + 2.75
-3.75y + y2 = 0 + 2.75

Combine like terms: 0 + 2.75 = 2.75
-3.75y + y2 = 2.75

The y term is -3.75y.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75y + 3.515625 + y2 = 2.75 + 3.515625

Reorder the terms:
3.515625 + -3.75y + y2 = 2.75 + 3.515625

Combine like terms: 2.75 + 3.515625 = 6.265625
3.515625 + -3.75y + y2 = 6.265625

Factor a perfect square on the left side:
(y + -1.875)(y + -1.875) = 6.265625

Calculate the square root of the right side: 2.503123049

Break this problem into two subproblems by setting 
(y + -1.875) equal to 2.503123049 and -2.503123049.

Subproblem 1

y + -1.875 = 2.503123049 Simplifying y + -1.875 = 2.503123049 Reorder the terms: -1.875 + y = 2.503123049 Solving -1.875 + y = 2.503123049 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + y = 2.503123049 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + y = 2.503123049 + 1.875 y = 2.503123049 + 1.875 Combine like terms: 2.503123049 + 1.875 = 4.378123049 y = 4.378123049 Simplifying y = 4.378123049

Subproblem 2

y + -1.875 = -2.503123049 Simplifying y + -1.875 = -2.503123049 Reorder the terms: -1.875 + y = -2.503123049 Solving -1.875 + y = -2.503123049 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + y = -2.503123049 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + y = -2.503123049 + 1.875 y = -2.503123049 + 1.875 Combine like terms: -2.503123049 + 1.875 = -0.628123049 y = -0.628123049 Simplifying y = -0.628123049

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.378123049, -0.628123049}

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