y^2+16y=-13

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Solution for y^2+16y=-13 equation:


Simplifying
y2 + 16y = -13

Reorder the terms:
16y + y2 = -13

Solving
16y + y2 = -13

Solving for variable 'y'.

Reorder the terms:
13 + 16y + y2 = -13 + 13

Combine like terms: -13 + 13 = 0
13 + 16y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-13' to each side of the equation.
13 + 16y + -13 + y2 = 0 + -13

Reorder the terms:
13 + -13 + 16y + y2 = 0 + -13

Combine like terms: 13 + -13 = 0
0 + 16y + y2 = 0 + -13
16y + y2 = 0 + -13

Combine like terms: 0 + -13 = -13
16y + y2 = -13

The y term is 16y.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16y + 64 + y2 = -13 + 64

Reorder the terms:
64 + 16y + y2 = -13 + 64

Combine like terms: -13 + 64 = 51
64 + 16y + y2 = 51

Factor a perfect square on the left side:
(y + 8)(y + 8) = 51

Calculate the square root of the right side: 7.141428429

Break this problem into two subproblems by setting 
(y + 8) equal to 7.141428429 and -7.141428429.

Subproblem 1

y + 8 = 7.141428429 Simplifying y + 8 = 7.141428429 Reorder the terms: 8 + y = 7.141428429 Solving 8 + y = 7.141428429 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + y = 7.141428429 + -8 Combine like terms: 8 + -8 = 0 0 + y = 7.141428429 + -8 y = 7.141428429 + -8 Combine like terms: 7.141428429 + -8 = -0.858571571 y = -0.858571571 Simplifying y = -0.858571571

Subproblem 2

y + 8 = -7.141428429 Simplifying y + 8 = -7.141428429 Reorder the terms: 8 + y = -7.141428429 Solving 8 + y = -7.141428429 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + y = -7.141428429 + -8 Combine like terms: 8 + -8 = 0 0 + y = -7.141428429 + -8 y = -7.141428429 + -8 Combine like terms: -7.141428429 + -8 = -15.141428429 y = -15.141428429 Simplifying y = -15.141428429

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.858571571, -15.141428429}

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