(x-5)(x-5)=8

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Solution for (x-5)(x-5)=8 equation:


Simplifying
(x + -5)(x + -5) = 8

Reorder the terms:
(-5 + x)(x + -5) = 8

Reorder the terms:
(-5 + x)(-5 + x) = 8

Multiply (-5 + x) * (-5 + x)
(-5(-5 + x) + x(-5 + x)) = 8
((-5 * -5 + x * -5) + x(-5 + x)) = 8
((25 + -5x) + x(-5 + x)) = 8
(25 + -5x + (-5 * x + x * x)) = 8
(25 + -5x + (-5x + x2)) = 8

Combine like terms: -5x + -5x = -10x
(25 + -10x + x2) = 8

Solving
25 + -10x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
25 + -8 + -10x + x2 = 8 + -8

Combine like terms: 25 + -8 = 17
17 + -10x + x2 = 8 + -8

Combine like terms: 8 + -8 = 0
17 + -10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-17' to each side of the equation.
17 + -10x + -17 + x2 = 0 + -17

Reorder the terms:
17 + -17 + -10x + x2 = 0 + -17

Combine like terms: 17 + -17 = 0
0 + -10x + x2 = 0 + -17
-10x + x2 = 0 + -17

Combine like terms: 0 + -17 = -17
-10x + x2 = -17

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -17 + 25

Reorder the terms:
25 + -10x + x2 = -17 + 25

Combine like terms: -17 + 25 = 8
25 + -10x + x2 = 8

Factor a perfect square on the left side:
(x + -5)(x + -5) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(x + -5) equal to 2.828427125 and -2.828427125.

Subproblem 1

x + -5 = 2.828427125 Simplifying x + -5 = 2.828427125 Reorder the terms: -5 + x = 2.828427125 Solving -5 + x = 2.828427125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 2.828427125 + 5 Combine like terms: -5 + 5 = 0 0 + x = 2.828427125 + 5 x = 2.828427125 + 5 Combine like terms: 2.828427125 + 5 = 7.828427125 x = 7.828427125 Simplifying x = 7.828427125

Subproblem 2

x + -5 = -2.828427125 Simplifying x + -5 = -2.828427125 Reorder the terms: -5 + x = -2.828427125 Solving -5 + x = -2.828427125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -2.828427125 + 5 Combine like terms: -5 + 5 = 0 0 + x = -2.828427125 + 5 x = -2.828427125 + 5 Combine like terms: -2.828427125 + 5 = 2.171572875 x = 2.171572875 Simplifying x = 2.171572875

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.828427125, 2.171572875}

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