y^2+8y-15=180

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Solution for y^2+8y-15=180 equation:


Simplifying
y2 + 8y + -15 = 180

Reorder the terms:
-15 + 8y + y2 = 180

Solving
-15 + 8y + y2 = 180

Solving for variable 'y'.

Reorder the terms:
-15 + -180 + 8y + y2 = 180 + -180

Combine like terms: -15 + -180 = -195
-195 + 8y + y2 = 180 + -180

Combine like terms: 180 + -180 = 0
-195 + 8y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '195' to each side of the equation.
-195 + 8y + 195 + y2 = 0 + 195

Reorder the terms:
-195 + 195 + 8y + y2 = 0 + 195

Combine like terms: -195 + 195 = 0
0 + 8y + y2 = 0 + 195
8y + y2 = 0 + 195

Combine like terms: 0 + 195 = 195
8y + y2 = 195

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 = 195 + 16

Reorder the terms:
16 + 8y + y2 = 195 + 16

Combine like terms: 195 + 16 = 211
16 + 8y + y2 = 211

Factor a perfect square on the left side:
(y + 4)(y + 4) = 211

Calculate the square root of the right side: 14.525839046

Break this problem into two subproblems by setting 
(y + 4) equal to 14.525839046 and -14.525839046.

Subproblem 1

y + 4 = 14.525839046 Simplifying y + 4 = 14.525839046 Reorder the terms: 4 + y = 14.525839046 Solving 4 + y = 14.525839046 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 = 14.525839046 + -4 Combine like terms: 4 + -4 = 0 0 + y = 14.525839046 + -4 y = 14.525839046 + -4 Combine like terms: 14.525839046 + -4 = 10.525839046 y = 10.525839046 Simplifying y = 10.525839046

Subproblem 2

y + 4 = -14.525839046 Simplifying y + 4 = -14.525839046 Reorder the terms: 4 + y = -14.525839046 Solving 4 + y = -14.525839046 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 = -14.525839046 + -4 Combine like terms: 4 + -4 = 0 0 + y = -14.525839046 + -4 y = -14.525839046 + -4 Combine like terms: -14.525839046 + -4 = -18.525839046 y = -18.525839046 Simplifying y = -18.525839046

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.525839046, -18.525839046}

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