y^2+10y-26=0

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Solution for y^2+10y-26=0 equation:


Simplifying
y2 + 10y + -26 = 0

Reorder the terms:
-26 + 10y + y2 = 0

Solving
-26 + 10y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + 10y + 26 + y2 = 0 + 26

Reorder the terms:
-26 + 26 + 10y + y2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + 10y + y2 = 0 + 26
10y + y2 = 0 + 26

Combine like terms: 0 + 26 = 26
10y + y2 = 26

The y term is 10y.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10y + 25 + y2 = 26 + 25

Reorder the terms:
25 + 10y + y2 = 26 + 25

Combine like terms: 26 + 25 = 51
25 + 10y + y2 = 51

Factor a perfect square on the left side:
(y + 5)(y + 5) = 51

Calculate the square root of the right side: 7.141428429

Break this problem into two subproblems by setting 
(y + 5) equal to 7.141428429 and -7.141428429.

Subproblem 1

y + 5 = 7.141428429 Simplifying y + 5 = 7.141428429 Reorder the terms: 5 + y = 7.141428429 Solving 5 + y = 7.141428429 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = 7.141428429 + -5 Combine like terms: 5 + -5 = 0 0 + y = 7.141428429 + -5 y = 7.141428429 + -5 Combine like terms: 7.141428429 + -5 = 2.141428429 y = 2.141428429 Simplifying y = 2.141428429

Subproblem 2

y + 5 = -7.141428429 Simplifying y + 5 = -7.141428429 Reorder the terms: 5 + y = -7.141428429 Solving 5 + y = -7.141428429 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = -7.141428429 + -5 Combine like terms: 5 + -5 = 0 0 + y = -7.141428429 + -5 y = -7.141428429 + -5 Combine like terms: -7.141428429 + -5 = -12.141428429 y = -12.141428429 Simplifying y = -12.141428429

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.141428429, -12.141428429}

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