y^2+10y-80=0

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Solution for y^2+10y-80=0 equation:


Simplifying
y2 + 10y + -80 = 0

Reorder the terms:
-80 + 10y + y2 = 0

Solving
-80 + 10y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 10y + 80 + y2 = 0 + 80

Reorder the terms:
-80 + 80 + 10y + y2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 10y + y2 = 0 + 80
10y + y2 = 0 + 80

Combine like terms: 0 + 80 = 80
10y + y2 = 80

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 = 80 + 25

Reorder the terms:
25 + 10y + y2 = 80 + 25

Combine like terms: 80 + 25 = 105
25 + 10y + y2 = 105

Factor a perfect square on the left side:
(y + 5)(y + 5) = 105

Calculate the square root of the right side: 10.246950766

Break this problem into two subproblems by setting 
(y + 5) equal to 10.246950766 and -10.246950766.

Subproblem 1

y + 5 = 10.246950766 Simplifying y + 5 = 10.246950766 Reorder the terms: 5 + y = 10.246950766 Solving 5 + y = 10.246950766 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 = 10.246950766 + -5 Combine like terms: 5 + -5 = 0 0 + y = 10.246950766 + -5 y = 10.246950766 + -5 Combine like terms: 10.246950766 + -5 = 5.246950766 y = 5.246950766 Simplifying y = 5.246950766

Subproblem 2

y + 5 = -10.246950766 Simplifying y + 5 = -10.246950766 Reorder the terms: 5 + y = -10.246950766 Solving 5 + y = -10.246950766 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 = -10.246950766 + -5 Combine like terms: 5 + -5 = 0 0 + y = -10.246950766 + -5 y = -10.246950766 + -5 Combine like terms: -10.246950766 + -5 = -15.246950766 y = -15.246950766 Simplifying y = -15.246950766

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.246950766, -15.246950766}

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