(x+5)(x-7)=14

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Solution for (x+5)(x-7)=14 equation:


Simplifying
(x + 5)(x + -7) = 14

Reorder the terms:
(5 + x)(x + -7) = 14

Reorder the terms:
(5 + x)(-7 + x) = 14

Multiply (5 + x) * (-7 + x)
(5(-7 + x) + x(-7 + x)) = 14
((-7 * 5 + x * 5) + x(-7 + x)) = 14
((-35 + 5x) + x(-7 + x)) = 14
(-35 + 5x + (-7 * x + x * x)) = 14
(-35 + 5x + (-7x + x2)) = 14

Combine like terms: 5x + -7x = -2x
(-35 + -2x + x2) = 14

Solving
-35 + -2x + x2 = 14

Solving for variable 'x'.

Reorder the terms:
-35 + -14 + -2x + x2 = 14 + -14

Combine like terms: -35 + -14 = -49
-49 + -2x + x2 = 14 + -14

Combine like terms: 14 + -14 = 0
-49 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + -2x + 49 + x2 = 0 + 49

Reorder the terms:
-49 + 49 + -2x + x2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + -2x + x2 = 0 + 49
-2x + x2 = 0 + 49

Combine like terms: 0 + 49 = 49
-2x + x2 = 49

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 = 49 + 1

Reorder the terms:
1 + -2x + x2 = 49 + 1

Combine like terms: 49 + 1 = 50
1 + -2x + x2 = 50

Factor a perfect square on the left side:
(x + -1)(x + -1) = 50

Calculate the square root of the right side: 7.071067812

Break this problem into two subproblems by setting 
(x + -1) equal to 7.071067812 and -7.071067812.

Subproblem 1

x + -1 = 7.071067812 Simplifying x + -1 = 7.071067812 Reorder the terms: -1 + x = 7.071067812 Solving -1 + x = 7.071067812 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 = 7.071067812 + 1 Combine like terms: -1 + 1 = 0 0 + x = 7.071067812 + 1 x = 7.071067812 + 1 Combine like terms: 7.071067812 + 1 = 8.071067812 x = 8.071067812 Simplifying x = 8.071067812

Subproblem 2

x + -1 = -7.071067812 Simplifying x + -1 = -7.071067812 Reorder the terms: -1 + x = -7.071067812 Solving -1 + x = -7.071067812 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 = -7.071067812 + 1 Combine like terms: -1 + 1 = 0 0 + x = -7.071067812 + 1 x = -7.071067812 + 1 Combine like terms: -7.071067812 + 1 = -6.071067812 x = -6.071067812 Simplifying x = -6.071067812

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.071067812, -6.071067812}

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