(x+4)(x-2)=440

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Solution for (x+4)(x-2)=440 equation:


Simplifying
(x + 4)(x + -2) = 440

Reorder the terms:
(4 + x)(x + -2) = 440

Reorder the terms:
(4 + x)(-2 + x) = 440

Multiply (4 + x) * (-2 + x)
(4(-2 + x) + x(-2 + x)) = 440
((-2 * 4 + x * 4) + x(-2 + x)) = 440
((-8 + 4x) + x(-2 + x)) = 440
(-8 + 4x + (-2 * x + x * x)) = 440
(-8 + 4x + (-2x + x2)) = 440

Combine like terms: 4x + -2x = 2x
(-8 + 2x + x2) = 440

Solving
-8 + 2x + x2 = 440

Solving for variable 'x'.

Reorder the terms:
-8 + -440 + 2x + x2 = 440 + -440

Combine like terms: -8 + -440 = -448
-448 + 2x + x2 = 440 + -440

Combine like terms: 440 + -440 = 0
-448 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '448' to each side of the equation.
-448 + 2x + 448 + x2 = 0 + 448

Reorder the terms:
-448 + 448 + 2x + x2 = 0 + 448

Combine like terms: -448 + 448 = 0
0 + 2x + x2 = 0 + 448
2x + x2 = 0 + 448

Combine like terms: 0 + 448 = 448
2x + x2 = 448

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 = 448 + 1

Reorder the terms:
1 + 2x + x2 = 448 + 1

Combine like terms: 448 + 1 = 449
1 + 2x + x2 = 449

Factor a perfect square on the left side:
(x + 1)(x + 1) = 449

Calculate the square root of the right side: 21.1896201

Break this problem into two subproblems by setting 
(x + 1) equal to 21.1896201 and -21.1896201.

Subproblem 1

x + 1 = 21.1896201 Simplifying x + 1 = 21.1896201 Reorder the terms: 1 + x = 21.1896201 Solving 1 + x = 21.1896201 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 = 21.1896201 + -1 Combine like terms: 1 + -1 = 0 0 + x = 21.1896201 + -1 x = 21.1896201 + -1 Combine like terms: 21.1896201 + -1 = 20.1896201 x = 20.1896201 Simplifying x = 20.1896201

Subproblem 2

x + 1 = -21.1896201 Simplifying x + 1 = -21.1896201 Reorder the terms: 1 + x = -21.1896201 Solving 1 + x = -21.1896201 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 = -21.1896201 + -1 Combine like terms: 1 + -1 = 0 0 + x = -21.1896201 + -1 x = -21.1896201 + -1 Combine like terms: -21.1896201 + -1 = -22.1896201 x = -22.1896201 Simplifying x = -22.1896201

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.1896201, -22.1896201}

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