(x-2)(x+4)=3

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Solution for (x-2)(x+4)=3 equation:


Simplifying
(x + -2)(x + 4) = 3

Reorder the terms:
(-2 + x)(x + 4) = 3

Reorder the terms:
(-2 + x)(4 + x) = 3

Multiply (-2 + x) * (4 + x)
(-2(4 + x) + x(4 + x)) = 3
((4 * -2 + x * -2) + x(4 + x)) = 3
((-8 + -2x) + x(4 + x)) = 3
(-8 + -2x + (4 * x + x * x)) = 3
(-8 + -2x + (4x + x2)) = 3

Combine like terms: -2x + 4x = 2x
(-8 + 2x + x2) = 3

Solving
-8 + 2x + x2 = 3

Solving for variable 'x'.

Reorder the terms:
-8 + -3 + 2x + x2 = 3 + -3

Combine like terms: -8 + -3 = -11
-11 + 2x + x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-11 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 2x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 2x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 2x + x2 = 0 + 11
2x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
2x + x2 = 11

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 = 11 + 1

Reorder the terms:
1 + 2x + x2 = 11 + 1

Combine like terms: 11 + 1 = 12
1 + 2x + x2 = 12

Factor a perfect square on the left side:
(x + 1)(x + 1) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(x + 1) equal to 3.464101615 and -3.464101615.

Subproblem 1

x + 1 = 3.464101615 Simplifying x + 1 = 3.464101615 Reorder the terms: 1 + x = 3.464101615 Solving 1 + x = 3.464101615 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 = 3.464101615 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.464101615 + -1 x = 3.464101615 + -1 Combine like terms: 3.464101615 + -1 = 2.464101615 x = 2.464101615 Simplifying x = 2.464101615

Subproblem 2

x + 1 = -3.464101615 Simplifying x + 1 = -3.464101615 Reorder the terms: 1 + x = -3.464101615 Solving 1 + x = -3.464101615 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 = -3.464101615 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.464101615 + -1 x = -3.464101615 + -1 Combine like terms: -3.464101615 + -1 = -4.464101615 x = -4.464101615 Simplifying x = -4.464101615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.464101615, -4.464101615}

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