(x+4)(x-6)=216

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Solution for (x+4)(x-6)=216 equation:


Simplifying
(x + 4)(x + -6) = 216

Reorder the terms:
(4 + x)(x + -6) = 216

Reorder the terms:
(4 + x)(-6 + x) = 216

Multiply (4 + x) * (-6 + x)
(4(-6 + x) + x(-6 + x)) = 216
((-6 * 4 + x * 4) + x(-6 + x)) = 216
((-24 + 4x) + x(-6 + x)) = 216
(-24 + 4x + (-6 * x + x * x)) = 216
(-24 + 4x + (-6x + x2)) = 216

Combine like terms: 4x + -6x = -2x
(-24 + -2x + x2) = 216

Solving
-24 + -2x + x2 = 216

Solving for variable 'x'.

Reorder the terms:
-24 + -216 + -2x + x2 = 216 + -216

Combine like terms: -24 + -216 = -240
-240 + -2x + x2 = 216 + -216

Combine like terms: 216 + -216 = 0
-240 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '240' to each side of the equation.
-240 + -2x + 240 + x2 = 0 + 240

Reorder the terms:
-240 + 240 + -2x + x2 = 0 + 240

Combine like terms: -240 + 240 = 0
0 + -2x + x2 = 0 + 240
-2x + x2 = 0 + 240

Combine like terms: 0 + 240 = 240
-2x + x2 = 240

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 240 + 1

Reorder the terms:
1 + -2x + x2 = 240 + 1

Combine like terms: 240 + 1 = 241
1 + -2x + x2 = 241

Factor a perfect square on the left side:
(x + -1)(x + -1) = 241

Calculate the square root of the right side: 15.524174696

Break this problem into two subproblems by setting 
(x + -1) equal to 15.524174696 and -15.524174696.

Subproblem 1

x + -1 = 15.524174696 Simplifying x + -1 = 15.524174696 Reorder the terms: -1 + x = 15.524174696 Solving -1 + x = 15.524174696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 15.524174696 + 1 Combine like terms: -1 + 1 = 0 0 + x = 15.524174696 + 1 x = 15.524174696 + 1 Combine like terms: 15.524174696 + 1 = 16.524174696 x = 16.524174696 Simplifying x = 16.524174696

Subproblem 2

x + -1 = -15.524174696 Simplifying x + -1 = -15.524174696 Reorder the terms: -1 + x = -15.524174696 Solving -1 + x = -15.524174696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -15.524174696 + 1 Combine like terms: -1 + 1 = 0 0 + x = -15.524174696 + 1 x = -15.524174696 + 1 Combine like terms: -15.524174696 + 1 = -14.524174696 x = -14.524174696 Simplifying x = -14.524174696

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.524174696, -14.524174696}

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