100=(x+11)(x-5)

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Solution for 100=(x+11)(x-5) equation:


Simplifying
100 = (x + 11)(x + -5)

Reorder the terms:
100 = (11 + x)(x + -5)

Reorder the terms:
100 = (11 + x)(-5 + x)

Multiply (11 + x) * (-5 + x)
100 = (11(-5 + x) + x(-5 + x))
100 = ((-5 * 11 + x * 11) + x(-5 + x))
100 = ((-55 + 11x) + x(-5 + x))
100 = (-55 + 11x + (-5 * x + x * x))
100 = (-55 + 11x + (-5x + x2))

Combine like terms: 11x + -5x = 6x
100 = (-55 + 6x + x2)

Solving
100 = -55 + 6x + x2

Solving for variable 'x'.

Combine like terms: 100 + 55 = 155
155 + -6x + -1x2 = -55 + 6x + x2 + 55 + -6x + -1x2

Reorder the terms:
155 + -6x + -1x2 = -55 + 55 + 6x + -6x + x2 + -1x2

Combine like terms: -55 + 55 = 0
155 + -6x + -1x2 = 0 + 6x + -6x + x2 + -1x2
155 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
155 + -6x + -1x2 = 0 + x2 + -1x2
155 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
155 + -6x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-155 + 6x + x2 = 0

Move the constant term to the right:

Add '155' to each side of the equation.
-155 + 6x + 155 + x2 = 0 + 155

Reorder the terms:
-155 + 155 + 6x + x2 = 0 + 155

Combine like terms: -155 + 155 = 0
0 + 6x + x2 = 0 + 155
6x + x2 = 0 + 155

Combine like terms: 0 + 155 = 155
6x + x2 = 155

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 155 + 9

Reorder the terms:
9 + 6x + x2 = 155 + 9

Combine like terms: 155 + 9 = 164
9 + 6x + x2 = 164

Factor a perfect square on the left side:
(x + 3)(x + 3) = 164

Calculate the square root of the right side: 12.806248475

Break this problem into two subproblems by setting 
(x + 3) equal to 12.806248475 and -12.806248475.

Subproblem 1

x + 3 = 12.806248475 Simplifying x + 3 = 12.806248475 Reorder the terms: 3 + x = 12.806248475 Solving 3 + x = 12.806248475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 12.806248475 + -3 Combine like terms: 3 + -3 = 0 0 + x = 12.806248475 + -3 x = 12.806248475 + -3 Combine like terms: 12.806248475 + -3 = 9.806248475 x = 9.806248475 Simplifying x = 9.806248475

Subproblem 2

x + 3 = -12.806248475 Simplifying x + 3 = -12.806248475 Reorder the terms: 3 + x = -12.806248475 Solving 3 + x = -12.806248475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -12.806248475 + -3 Combine like terms: 3 + -3 = 0 0 + x = -12.806248475 + -3 x = -12.806248475 + -3 Combine like terms: -12.806248475 + -3 = -15.806248475 x = -15.806248475 Simplifying x = -15.806248475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.806248475, -15.806248475}

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