y^2+6y=-7

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Solution for y^2+6y=-7 equation:


Simplifying
y2 + 6y = -7

Reorder the terms:
6y + y2 = -7

Solving
6y + y2 = -7

Solving for variable 'y'.

Reorder the terms:
7 + 6y + y2 = -7 + 7

Combine like terms: -7 + 7 = 0
7 + 6y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + 6y + -7 + y2 = 0 + -7

Reorder the terms:
7 + -7 + 6y + y2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 6y + y2 = 0 + -7
6y + y2 = 0 + -7

Combine like terms: 0 + -7 = -7
6y + y2 = -7

The y term is 6y.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6y + 9 + y2 = -7 + 9

Reorder the terms:
9 + 6y + y2 = -7 + 9

Combine like terms: -7 + 9 = 2
9 + 6y + y2 = 2

Factor a perfect square on the left side:
(y + 3)(y + 3) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(y + 3) equal to 1.414213562 and -1.414213562.

Subproblem 1

y + 3 = 1.414213562 Simplifying y + 3 = 1.414213562 Reorder the terms: 3 + y = 1.414213562 Solving 3 + y = 1.414213562 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = 1.414213562 + -3 Combine like terms: 3 + -3 = 0 0 + y = 1.414213562 + -3 y = 1.414213562 + -3 Combine like terms: 1.414213562 + -3 = -1.585786438 y = -1.585786438 Simplifying y = -1.585786438

Subproblem 2

y + 3 = -1.414213562 Simplifying y + 3 = -1.414213562 Reorder the terms: 3 + y = -1.414213562 Solving 3 + y = -1.414213562 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = -1.414213562 + -3 Combine like terms: 3 + -3 = 0 0 + y = -1.414213562 + -3 y = -1.414213562 + -3 Combine like terms: -1.414213562 + -3 = -4.414213562 y = -4.414213562 Simplifying y = -4.414213562

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.585786438, -4.414213562}

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