100=x(x+6)

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Solution for 100=x(x+6) equation:


Simplifying
100 = x(x + 6)

Reorder the terms:
100 = x(6 + x)
100 = (6 * x + x * x)
100 = (6x + x2)

Solving
100 = 6x + x2

Solving for variable 'x'.

Reorder the terms:
100 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
100 + -6x + -1x2 = 0 + x2 + -1x2
100 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
100 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-100 + 6x + x2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 6x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 6x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 6x + x2 = 0 + 100
6x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
6x + x2 = 100

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 = 100 + 9

Reorder the terms:
9 + 6x + x2 = 100 + 9

Combine like terms: 100 + 9 = 109
9 + 6x + x2 = 109

Factor a perfect square on the left side:
(x + 3)(x + 3) = 109

Calculate the square root of the right side: 10.440306509

Break this problem into two subproblems by setting 
(x + 3) equal to 10.440306509 and -10.440306509.

Subproblem 1

x + 3 = 10.440306509 Simplifying x + 3 = 10.440306509 Reorder the terms: 3 + x = 10.440306509 Solving 3 + x = 10.440306509 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 = 10.440306509 + -3 Combine like terms: 3 + -3 = 0 0 + x = 10.440306509 + -3 x = 10.440306509 + -3 Combine like terms: 10.440306509 + -3 = 7.440306509 x = 7.440306509 Simplifying x = 7.440306509

Subproblem 2

x + 3 = -10.440306509 Simplifying x + 3 = -10.440306509 Reorder the terms: 3 + x = -10.440306509 Solving 3 + x = -10.440306509 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 = -10.440306509 + -3 Combine like terms: 3 + -3 = 0 0 + x = -10.440306509 + -3 x = -10.440306509 + -3 Combine like terms: -10.440306509 + -3 = -13.440306509 x = -13.440306509 Simplifying x = -13.440306509

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.440306509, -13.440306509}

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