0=y^2-3y-13

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Solution for 0=y^2-3y-13 equation:


Simplifying
0 = y2 + -3y + -13

Reorder the terms:
0 = -13 + -3y + y2

Solving
0 = -13 + -3y + y2

Solving for variable 'y'.

Combine like terms: 0 + 13 = 13
13 + 3y + -1y2 = -13 + -3y + y2 + 13 + 3y + -1y2

Reorder the terms:
13 + 3y + -1y2 = -13 + 13 + -3y + 3y + y2 + -1y2

Combine like terms: -13 + 13 = 0
13 + 3y + -1y2 = 0 + -3y + 3y + y2 + -1y2
13 + 3y + -1y2 = -3y + 3y + y2 + -1y2

Combine like terms: -3y + 3y = 0
13 + 3y + -1y2 = 0 + y2 + -1y2
13 + 3y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
13 + 3y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-13 + -3y + y2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -3y + 13 + y2 = 0 + 13

Reorder the terms:
-13 + 13 + -3y + y2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -3y + y2 = 0 + 13
-3y + y2 = 0 + 13

Combine like terms: 0 + 13 = 13
-3y + y2 = 13

The y term is -3y.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3y + 2.25 + y2 = 13 + 2.25

Reorder the terms:
2.25 + -3y + y2 = 13 + 2.25

Combine like terms: 13 + 2.25 = 15.25
2.25 + -3y + y2 = 15.25

Factor a perfect square on the left side:
(y + -1.5)(y + -1.5) = 15.25

Calculate the square root of the right side: 3.905124838

Break this problem into two subproblems by setting 
(y + -1.5) equal to 3.905124838 and -3.905124838.

Subproblem 1

y + -1.5 = 3.905124838 Simplifying y + -1.5 = 3.905124838 Reorder the terms: -1.5 + y = 3.905124838 Solving -1.5 + y = 3.905124838 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = 3.905124838 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = 3.905124838 + 1.5 y = 3.905124838 + 1.5 Combine like terms: 3.905124838 + 1.5 = 5.405124838 y = 5.405124838 Simplifying y = 5.405124838

Subproblem 2

y + -1.5 = -3.905124838 Simplifying y + -1.5 = -3.905124838 Reorder the terms: -1.5 + y = -3.905124838 Solving -1.5 + y = -3.905124838 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = -3.905124838 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = -3.905124838 + 1.5 y = -3.905124838 + 1.5 Combine like terms: -3.905124838 + 1.5 = -2.405124838 y = -2.405124838 Simplifying y = -2.405124838

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.405124838, -2.405124838}

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