y^2+y=26

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Solution for y^2+y=26 equation:


Simplifying
y2 + y = 26

Reorder the terms:
y + y2 = 26

Solving
y + y2 = 26

Solving for variable 'y'.

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

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

Begin completing the square.

Move the constant term to the right:

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

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

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

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

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
y + 0.25 + y2 = 26 + 0.25

Reorder the terms:
0.25 + y + y2 = 26 + 0.25

Combine like terms: 26 + 0.25 = 26.25
0.25 + y + y2 = 26.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(y + 0.5) equal to 5.123475383 and -5.123475383.

Subproblem 1

y + 0.5 = 5.123475383 Simplifying y + 0.5 = 5.123475383 Reorder the terms: 0.5 + y = 5.123475383 Solving 0.5 + y = 5.123475383 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 5.123475383 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 5.123475383 + -0.5 y = 5.123475383 + -0.5 Combine like terms: 5.123475383 + -0.5 = 4.623475383 y = 4.623475383 Simplifying y = 4.623475383

Subproblem 2

y + 0.5 = -5.123475383 Simplifying y + 0.5 = -5.123475383 Reorder the terms: 0.5 + y = -5.123475383 Solving 0.5 + y = -5.123475383 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -5.123475383 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -5.123475383 + -0.5 y = -5.123475383 + -0.5 Combine like terms: -5.123475383 + -0.5 = -5.623475383 y = -5.623475383 Simplifying y = -5.623475383

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.623475383, -5.623475383}

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