y^2+7y=104

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Solution for y^2+7y=104 equation:


Simplifying
y2 + 7y = 104

Reorder the terms:
7y + y2 = 104

Solving
7y + y2 = 104

Solving for variable 'y'.

Reorder the terms:
-104 + 7y + y2 = 104 + -104

Combine like terms: 104 + -104 = 0
-104 + 7y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + 7y + 104 + y2 = 0 + 104

Reorder the terms:
-104 + 104 + 7y + y2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + 7y + y2 = 0 + 104
7y + y2 = 0 + 104

Combine like terms: 0 + 104 = 104
7y + y2 = 104

The y term is 7y.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7y + 12.25 + y2 = 104 + 12.25

Reorder the terms:
12.25 + 7y + y2 = 104 + 12.25

Combine like terms: 104 + 12.25 = 116.25
12.25 + 7y + y2 = 116.25

Factor a perfect square on the left side:
(y + 3.5)(y + 3.5) = 116.25

Calculate the square root of the right side: 10.781929326

Break this problem into two subproblems by setting 
(y + 3.5) equal to 10.781929326 and -10.781929326.

Subproblem 1

y + 3.5 = 10.781929326 Simplifying y + 3.5 = 10.781929326 Reorder the terms: 3.5 + y = 10.781929326 Solving 3.5 + y = 10.781929326 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = 10.781929326 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = 10.781929326 + -3.5 y = 10.781929326 + -3.5 Combine like terms: 10.781929326 + -3.5 = 7.281929326 y = 7.281929326 Simplifying y = 7.281929326

Subproblem 2

y + 3.5 = -10.781929326 Simplifying y + 3.5 = -10.781929326 Reorder the terms: 3.5 + y = -10.781929326 Solving 3.5 + y = -10.781929326 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = -10.781929326 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = -10.781929326 + -3.5 y = -10.781929326 + -3.5 Combine like terms: -10.781929326 + -3.5 = -14.281929326 y = -14.281929326 Simplifying y = -14.281929326

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.281929326, -14.281929326}

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