y^2+8y-8=0

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Solution for y^2+8y-8=0 equation:


Simplifying
y2 + 8y + -8 = 0

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

Solving
-8 + 8y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

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

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

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

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

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 = 8 + 16

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

Combine like terms: 8 + 16 = 24
16 + 8y + y2 = 24

Factor a perfect square on the left side:
(y + 4)(y + 4) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(y + 4) equal to 4.898979486 and -4.898979486.

Subproblem 1

y + 4 = 4.898979486 Simplifying y + 4 = 4.898979486 Reorder the terms: 4 + y = 4.898979486 Solving 4 + y = 4.898979486 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 = 4.898979486 + -4 Combine like terms: 4 + -4 = 0 0 + y = 4.898979486 + -4 y = 4.898979486 + -4 Combine like terms: 4.898979486 + -4 = 0.898979486 y = 0.898979486 Simplifying y = 0.898979486

Subproblem 2

y + 4 = -4.898979486 Simplifying y + 4 = -4.898979486 Reorder the terms: 4 + y = -4.898979486 Solving 4 + y = -4.898979486 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 = -4.898979486 + -4 Combine like terms: 4 + -4 = 0 0 + y = -4.898979486 + -4 y = -4.898979486 + -4 Combine like terms: -4.898979486 + -4 = -8.898979486 y = -8.898979486 Simplifying y = -8.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.898979486, -8.898979486}

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