y^2-8y=49

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Solution for y^2-8y=49 equation:


Simplifying
y2 + -8y = 49

Reorder the terms:
-8y + y2 = 49

Solving
-8y + y2 = 49

Solving for variable 'y'.

Reorder the terms:
-49 + -8y + y2 = 49 + -49

Combine like terms: 49 + -49 = 0
-49 + -8y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + -8y + 49 + y2 = 0 + 49

Reorder the terms:
-49 + 49 + -8y + y2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + -8y + y2 = 0 + 49
-8y + y2 = 0 + 49

Combine like terms: 0 + 49 = 49
-8y + y2 = 49

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 = 49 + 16

Reorder the terms:
16 + -8y + y2 = 49 + 16

Combine like terms: 49 + 16 = 65
16 + -8y + y2 = 65

Factor a perfect square on the left side:
(y + -4)(y + -4) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(y + -4) equal to 8.062257748 and -8.062257748.

Subproblem 1

y + -4 = 8.062257748 Simplifying y + -4 = 8.062257748 Reorder the terms: -4 + y = 8.062257748 Solving -4 + y = 8.062257748 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 = 8.062257748 + 4 Combine like terms: -4 + 4 = 0 0 + y = 8.062257748 + 4 y = 8.062257748 + 4 Combine like terms: 8.062257748 + 4 = 12.062257748 y = 12.062257748 Simplifying y = 12.062257748

Subproblem 2

y + -4 = -8.062257748 Simplifying y + -4 = -8.062257748 Reorder the terms: -4 + y = -8.062257748 Solving -4 + y = -8.062257748 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 = -8.062257748 + 4 Combine like terms: -4 + 4 = 0 0 + y = -8.062257748 + 4 y = -8.062257748 + 4 Combine like terms: -8.062257748 + 4 = -4.062257748 y = -4.062257748 Simplifying y = -4.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. y = {12.062257748, -4.062257748}

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