y^2+8y+13=144

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Solution for y^2+8y+13=144 equation:


Simplifying
y2 + 8y + 13 = 144

Reorder the terms:
13 + 8y + y2 = 144

Solving
13 + 8y + y2 = 144

Solving for variable 'y'.

Reorder the terms:
13 + -144 + 8y + y2 = 144 + -144

Combine like terms: 13 + -144 = -131
-131 + 8y + y2 = 144 + -144

Combine like terms: 144 + -144 = 0
-131 + 8y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '131' to each side of the equation.
-131 + 8y + 131 + y2 = 0 + 131

Reorder the terms:
-131 + 131 + 8y + y2 = 0 + 131

Combine like terms: -131 + 131 = 0
0 + 8y + y2 = 0 + 131
8y + y2 = 0 + 131

Combine like terms: 0 + 131 = 131
8y + y2 = 131

The y term is 8y.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8y + 16 + y2 = 131 + 16

Reorder the terms:
16 + 8y + y2 = 131 + 16

Combine like terms: 131 + 16 = 147
16 + 8y + y2 = 147

Factor a perfect square on the left side:
(y + 4)(y + 4) = 147

Calculate the square root of the right side: 12.124355653

Break this problem into two subproblems by setting 
(y + 4) equal to 12.124355653 and -12.124355653.

Subproblem 1

y + 4 = 12.124355653 Simplifying y + 4 = 12.124355653 Reorder the terms: 4 + y = 12.124355653 Solving 4 + y = 12.124355653 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = 12.124355653 + -4 Combine like terms: 4 + -4 = 0 0 + y = 12.124355653 + -4 y = 12.124355653 + -4 Combine like terms: 12.124355653 + -4 = 8.124355653 y = 8.124355653 Simplifying y = 8.124355653

Subproblem 2

y + 4 = -12.124355653 Simplifying y + 4 = -12.124355653 Reorder the terms: 4 + y = -12.124355653 Solving 4 + y = -12.124355653 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = -12.124355653 + -4 Combine like terms: 4 + -4 = 0 0 + y = -12.124355653 + -4 y = -12.124355653 + -4 Combine like terms: -12.124355653 + -4 = -16.124355653 y = -16.124355653 Simplifying y = -16.124355653

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.124355653, -16.124355653}

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