y^2-8y=4

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Solution for y^2-8y=4 equation:


Simplifying
y2 + -8y = 4

Reorder the terms:
-8y + y2 = 4

Solving
-8y + y2 = 4

Solving for variable 'y'.

Reorder the terms:
-4 + -8y + y2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + -8y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -8y + 4 + y2 = 0 + 4

Reorder the terms:
-4 + 4 + -8y + y2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -8y + y2 = 0 + 4
-8y + y2 = 0 + 4

Combine like terms: 0 + 4 = 4
-8y + y2 = 4

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 = 4 + 16

Reorder the terms:
16 + -8y + y2 = 4 + 16

Combine like terms: 4 + 16 = 20
16 + -8y + y2 = 20

Factor a perfect square on the left side:
(y + -4)(y + -4) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(y + -4) equal to 4.472135955 and -4.472135955.

Subproblem 1

y + -4 = 4.472135955 Simplifying y + -4 = 4.472135955 Reorder the terms: -4 + y = 4.472135955 Solving -4 + y = 4.472135955 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 = 4.472135955 + 4 Combine like terms: -4 + 4 = 0 0 + y = 4.472135955 + 4 y = 4.472135955 + 4 Combine like terms: 4.472135955 + 4 = 8.472135955 y = 8.472135955 Simplifying y = 8.472135955

Subproblem 2

y + -4 = -4.472135955 Simplifying y + -4 = -4.472135955 Reorder the terms: -4 + y = -4.472135955 Solving -4 + y = -4.472135955 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 = -4.472135955 + 4 Combine like terms: -4 + 4 = 0 0 + y = -4.472135955 + 4 y = -4.472135955 + 4 Combine like terms: -4.472135955 + 4 = -0.472135955 y = -0.472135955 Simplifying y = -0.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.472135955, -0.472135955}

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