x(x+6)=140

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Solution for x(x+6)=140 equation:


Simplifying
x(x + 6) = 140

Reorder the terms:
x(6 + x) = 140
(6 * x + x * x) = 140
(6x + x2) = 140

Solving
6x + x2 = 140

Solving for variable 'x'.

Reorder the terms:
-140 + 6x + x2 = 140 + -140

Combine like terms: 140 + -140 = 0
-140 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '140' to each side of the equation.
-140 + 6x + 140 + x2 = 0 + 140

Reorder the terms:
-140 + 140 + 6x + x2 = 0 + 140

Combine like terms: -140 + 140 = 0
0 + 6x + x2 = 0 + 140
6x + x2 = 0 + 140

Combine like terms: 0 + 140 = 140
6x + x2 = 140

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 = 140 + 9

Reorder the terms:
9 + 6x + x2 = 140 + 9

Combine like terms: 140 + 9 = 149
9 + 6x + x2 = 149

Factor a perfect square on the left side:
(x + 3)(x + 3) = 149

Calculate the square root of the right side: 12.206555616

Break this problem into two subproblems by setting 
(x + 3) equal to 12.206555616 and -12.206555616.

Subproblem 1

x + 3 = 12.206555616 Simplifying x + 3 = 12.206555616 Reorder the terms: 3 + x = 12.206555616 Solving 3 + x = 12.206555616 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 = 12.206555616 + -3 Combine like terms: 3 + -3 = 0 0 + x = 12.206555616 + -3 x = 12.206555616 + -3 Combine like terms: 12.206555616 + -3 = 9.206555616 x = 9.206555616 Simplifying x = 9.206555616

Subproblem 2

x + 3 = -12.206555616 Simplifying x + 3 = -12.206555616 Reorder the terms: 3 + x = -12.206555616 Solving 3 + x = -12.206555616 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 = -12.206555616 + -3 Combine like terms: 3 + -3 = 0 0 + x = -12.206555616 + -3 x = -12.206555616 + -3 Combine like terms: -12.206555616 + -3 = -15.206555616 x = -15.206555616 Simplifying x = -15.206555616

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.206555616, -15.206555616}

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