7x+7=7x(x+8)-8

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Solution for 7x+7=7x(x+8)-8 equation:


Simplifying
7x + 7 = 7x(x + 8) + -8

Reorder the terms:
7 + 7x = 7x(x + 8) + -8

Reorder the terms:
7 + 7x = 7x(8 + x) + -8
7 + 7x = (8 * 7x + x * 7x) + -8
7 + 7x = (56x + 7x2) + -8

Reorder the terms:
7 + 7x = -8 + 56x + 7x2

Solving
7 + 7x = -8 + 56x + 7x2

Solving for variable 'x'.

Reorder the terms:
7 + 8 + 7x + -56x + -7x2 = -8 + 56x + 7x2 + 8 + -56x + -7x2

Combine like terms: 7 + 8 = 15
15 + 7x + -56x + -7x2 = -8 + 56x + 7x2 + 8 + -56x + -7x2

Combine like terms: 7x + -56x = -49x
15 + -49x + -7x2 = -8 + 56x + 7x2 + 8 + -56x + -7x2

Reorder the terms:
15 + -49x + -7x2 = -8 + 8 + 56x + -56x + 7x2 + -7x2

Combine like terms: -8 + 8 = 0
15 + -49x + -7x2 = 0 + 56x + -56x + 7x2 + -7x2
15 + -49x + -7x2 = 56x + -56x + 7x2 + -7x2

Combine like terms: 56x + -56x = 0
15 + -49x + -7x2 = 0 + 7x2 + -7x2
15 + -49x + -7x2 = 7x2 + -7x2

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

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
-2.142857143 + 7x + x2 = 0

Move the constant term to the right:

Add '2.142857143' to each side of the equation.
-2.142857143 + 7x + 2.142857143 + x2 = 0 + 2.142857143

Reorder the terms:
-2.142857143 + 2.142857143 + 7x + x2 = 0 + 2.142857143

Combine like terms: -2.142857143 + 2.142857143 = 0.000000000
0.000000000 + 7x + x2 = 0 + 2.142857143
7x + x2 = 0 + 2.142857143

Combine like terms: 0 + 2.142857143 = 2.142857143
7x + x2 = 2.142857143

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 2.142857143 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 2.142857143 + 12.25

Combine like terms: 2.142857143 + 12.25 = 14.392857143
12.25 + 7x + x2 = 14.392857143

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 14.392857143

Calculate the square root of the right side: 3.793791921

Break this problem into two subproblems by setting 
(x + 3.5) equal to 3.793791921 and -3.793791921.

Subproblem 1

x + 3.5 = 3.793791921 Simplifying x + 3.5 = 3.793791921 Reorder the terms: 3.5 + x = 3.793791921 Solving 3.5 + x = 3.793791921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 3.793791921 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 3.793791921 + -3.5 x = 3.793791921 + -3.5 Combine like terms: 3.793791921 + -3.5 = 0.293791921 x = 0.293791921 Simplifying x = 0.293791921

Subproblem 2

x + 3.5 = -3.793791921 Simplifying x + 3.5 = -3.793791921 Reorder the terms: 3.5 + x = -3.793791921 Solving 3.5 + x = -3.793791921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -3.793791921 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -3.793791921 + -3.5 x = -3.793791921 + -3.5 Combine like terms: -3.793791921 + -3.5 = -7.293791921 x = -7.293791921 Simplifying x = -7.293791921

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.293791921, -7.293791921}

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