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

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


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

Reorder the terms:
x + -7 + 14(7 + x) = (x + -7)(x + 7)
x + -7 + (7 * 14 + x * 14) = (x + -7)(x + 7)
x + -7 + (98 + 14x) = (x + -7)(x + 7)

Reorder the terms:
-7 + 98 + x + 14x = (x + -7)(x + 7)

Combine like terms: -7 + 98 = 91
91 + x + 14x = (x + -7)(x + 7)

Combine like terms: x + 14x = 15x
91 + 15x = (x + -7)(x + 7)

Reorder the terms:
91 + 15x = (-7 + x)(x + 7)

Reorder the terms:
91 + 15x = (-7 + x)(7 + x)

Multiply (-7 + x) * (7 + x)
91 + 15x = (-7(7 + x) + x(7 + x))
91 + 15x = ((7 * -7 + x * -7) + x(7 + x))
91 + 15x = ((-49 + -7x) + x(7 + x))
91 + 15x = (-49 + -7x + (7 * x + x * x))
91 + 15x = (-49 + -7x + (7x + x2))

Combine like terms: -7x + 7x = 0
91 + 15x = (-49 + 0 + x2)
91 + 15x = (-49 + x2)

Solving
91 + 15x = -49 + x2

Solving for variable 'x'.

Reorder the terms:
91 + 49 + 15x + -1x2 = -49 + x2 + 49 + -1x2

Combine like terms: 91 + 49 = 140
140 + 15x + -1x2 = -49 + x2 + 49 + -1x2

Reorder the terms:
140 + 15x + -1x2 = -49 + 49 + x2 + -1x2

Combine like terms: -49 + 49 = 0
140 + 15x + -1x2 = 0 + x2 + -1x2
140 + 15x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
140 + 15x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-140 + -15x + x2 = 0

Move the constant term to the right:

Add '140' to each side of the equation.
-140 + -15x + 140 + x2 = 0 + 140

Reorder the terms:
-140 + 140 + -15x + x2 = 0 + 140

Combine like terms: -140 + 140 = 0
0 + -15x + x2 = 0 + 140
-15x + x2 = 0 + 140

Combine like terms: 0 + 140 = 140
-15x + x2 = 140

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = 140 + 56.25

Reorder the terms:
56.25 + -15x + x2 = 140 + 56.25

Combine like terms: 140 + 56.25 = 196.25
56.25 + -15x + x2 = 196.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 196.25

Calculate the square root of the right side: 14.008925726

Break this problem into two subproblems by setting 
(x + -7.5) equal to 14.008925726 and -14.008925726.

Subproblem 1

x + -7.5 = 14.008925726 Simplifying x + -7.5 = 14.008925726 Reorder the terms: -7.5 + x = 14.008925726 Solving -7.5 + x = 14.008925726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 14.008925726 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 14.008925726 + 7.5 x = 14.008925726 + 7.5 Combine like terms: 14.008925726 + 7.5 = 21.508925726 x = 21.508925726 Simplifying x = 21.508925726

Subproblem 2

x + -7.5 = -14.008925726 Simplifying x + -7.5 = -14.008925726 Reorder the terms: -7.5 + x = -14.008925726 Solving -7.5 + x = -14.008925726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -14.008925726 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -14.008925726 + 7.5 x = -14.008925726 + 7.5 Combine like terms: -14.008925726 + 7.5 = -6.508925726 x = -6.508925726 Simplifying x = -6.508925726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.508925726, -6.508925726}

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