(y+8)(y+8)-7=49

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Solution for (y+8)(y+8)-7=49 equation:


Simplifying
(y + 8)(y + 8) + -7 = 49

Reorder the terms:
(8 + y)(y + 8) + -7 = 49

Reorder the terms:
(8 + y)(8 + y) + -7 = 49

Multiply (8 + y) * (8 + y)
(8(8 + y) + y(8 + y)) + -7 = 49
((8 * 8 + y * 8) + y(8 + y)) + -7 = 49
((64 + 8y) + y(8 + y)) + -7 = 49
(64 + 8y + (8 * y + y * y)) + -7 = 49
(64 + 8y + (8y + y2)) + -7 = 49

Combine like terms: 8y + 8y = 16y
(64 + 16y + y2) + -7 = 49

Reorder the terms:
64 + -7 + 16y + y2 = 49

Combine like terms: 64 + -7 = 57
57 + 16y + y2 = 49

Solving
57 + 16y + y2 = 49

Solving for variable 'y'.

Reorder the terms:
57 + -49 + 16y + y2 = 49 + -49

Combine like terms: 57 + -49 = 8
8 + 16y + y2 = 49 + -49

Combine like terms: 49 + -49 = 0
8 + 16y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + 16y + -8 + y2 = 0 + -8

Reorder the terms:
8 + -8 + 16y + y2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 16y + y2 = 0 + -8
16y + y2 = 0 + -8

Combine like terms: 0 + -8 = -8
16y + y2 = -8

The y term is 16y.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16y + 64 + y2 = -8 + 64

Reorder the terms:
64 + 16y + y2 = -8 + 64

Combine like terms: -8 + 64 = 56
64 + 16y + y2 = 56

Factor a perfect square on the left side:
(y + 8)(y + 8) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(y + 8) equal to 7.483314774 and -7.483314774.

Subproblem 1

y + 8 = 7.483314774 Simplifying y + 8 = 7.483314774 Reorder the terms: 8 + y = 7.483314774 Solving 8 + y = 7.483314774 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + y = 7.483314774 + -8 Combine like terms: 8 + -8 = 0 0 + y = 7.483314774 + -8 y = 7.483314774 + -8 Combine like terms: 7.483314774 + -8 = -0.516685226 y = -0.516685226 Simplifying y = -0.516685226

Subproblem 2

y + 8 = -7.483314774 Simplifying y + 8 = -7.483314774 Reorder the terms: 8 + y = -7.483314774 Solving 8 + y = -7.483314774 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + y = -7.483314774 + -8 Combine like terms: 8 + -8 = 0 0 + y = -7.483314774 + -8 y = -7.483314774 + -8 Combine like terms: -7.483314774 + -8 = -15.483314774 y = -15.483314774 Simplifying y = -15.483314774

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.516685226, -15.483314774}

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