y^2-26y-55=0

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Solution for y^2-26y-55=0 equation:


Simplifying
y2 + -26y + -55 = 0

Reorder the terms:
-55 + -26y + y2 = 0

Solving
-55 + -26y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + -26y + 55 + y2 = 0 + 55

Reorder the terms:
-55 + 55 + -26y + y2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + -26y + y2 = 0 + 55
-26y + y2 = 0 + 55

Combine like terms: 0 + 55 = 55
-26y + y2 = 55

The y term is -26y.  Take half its coefficient (-13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
-26y + 169 + y2 = 55 + 169

Reorder the terms:
169 + -26y + y2 = 55 + 169

Combine like terms: 55 + 169 = 224
169 + -26y + y2 = 224

Factor a perfect square on the left side:
(y + -13)(y + -13) = 224

Calculate the square root of the right side: 14.966629547

Break this problem into two subproblems by setting 
(y + -13) equal to 14.966629547 and -14.966629547.

Subproblem 1

y + -13 = 14.966629547 Simplifying y + -13 = 14.966629547 Reorder the terms: -13 + y = 14.966629547 Solving -13 + y = 14.966629547 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + y = 14.966629547 + 13 Combine like terms: -13 + 13 = 0 0 + y = 14.966629547 + 13 y = 14.966629547 + 13 Combine like terms: 14.966629547 + 13 = 27.966629547 y = 27.966629547 Simplifying y = 27.966629547

Subproblem 2

y + -13 = -14.966629547 Simplifying y + -13 = -14.966629547 Reorder the terms: -13 + y = -14.966629547 Solving -13 + y = -14.966629547 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + y = -14.966629547 + 13 Combine like terms: -13 + 13 = 0 0 + y = -14.966629547 + 13 y = -14.966629547 + 13 Combine like terms: -14.966629547 + 13 = -1.966629547 y = -1.966629547 Simplifying y = -1.966629547

Solution

The solution to the problem is based on the solutions from the subproblems. y = {27.966629547, -1.966629547}

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