(x-8)(x-8)=15

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Solution for (x-8)(x-8)=15 equation:


Simplifying
(x + -8)(x + -8) = 15

Reorder the terms:
(-8 + x)(x + -8) = 15

Reorder the terms:
(-8 + x)(-8 + x) = 15

Multiply (-8 + x) * (-8 + x)
(-8(-8 + x) + x(-8 + x)) = 15
((-8 * -8 + x * -8) + x(-8 + x)) = 15
((64 + -8x) + x(-8 + x)) = 15
(64 + -8x + (-8 * x + x * x)) = 15
(64 + -8x + (-8x + x2)) = 15

Combine like terms: -8x + -8x = -16x
(64 + -16x + x2) = 15

Solving
64 + -16x + x2 = 15

Solving for variable 'x'.

Reorder the terms:
64 + -15 + -16x + x2 = 15 + -15

Combine like terms: 64 + -15 = 49
49 + -16x + x2 = 15 + -15

Combine like terms: 15 + -15 = 0
49 + -16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-49' to each side of the equation.
49 + -16x + -49 + x2 = 0 + -49

Reorder the terms:
49 + -49 + -16x + x2 = 0 + -49

Combine like terms: 49 + -49 = 0
0 + -16x + x2 = 0 + -49
-16x + x2 = 0 + -49

Combine like terms: 0 + -49 = -49
-16x + x2 = -49

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

Add '64' to each side of the equation.
-16x + 64 + x2 = -49 + 64

Reorder the terms:
64 + -16x + x2 = -49 + 64

Combine like terms: -49 + 64 = 15
64 + -16x + x2 = 15

Factor a perfect square on the left side:
(x + -8)(x + -8) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x + -8) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + -8 = 3.872983346 Simplifying x + -8 = 3.872983346 Reorder the terms: -8 + x = 3.872983346 Solving -8 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 3.872983346 + 8 Combine like terms: -8 + 8 = 0 0 + x = 3.872983346 + 8 x = 3.872983346 + 8 Combine like terms: 3.872983346 + 8 = 11.872983346 x = 11.872983346 Simplifying x = 11.872983346

Subproblem 2

x + -8 = -3.872983346 Simplifying x + -8 = -3.872983346 Reorder the terms: -8 + x = -3.872983346 Solving -8 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -3.872983346 + 8 Combine like terms: -8 + 8 = 0 0 + x = -3.872983346 + 8 x = -3.872983346 + 8 Combine like terms: -3.872983346 + 8 = 4.127016654 x = 4.127016654 Simplifying x = 4.127016654

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.872983346, 4.127016654}

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