(x-1)(x+12)=7

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Solution for (x-1)(x+12)=7 equation:


Simplifying
(x + -1)(x + 12) = 7

Reorder the terms:
(-1 + x)(x + 12) = 7

Reorder the terms:
(-1 + x)(12 + x) = 7

Multiply (-1 + x) * (12 + x)
(-1(12 + x) + x(12 + x)) = 7
((12 * -1 + x * -1) + x(12 + x)) = 7
((-12 + -1x) + x(12 + x)) = 7
(-12 + -1x + (12 * x + x * x)) = 7
(-12 + -1x + (12x + x2)) = 7

Combine like terms: -1x + 12x = 11x
(-12 + 11x + x2) = 7

Solving
-12 + 11x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
-12 + -7 + 11x + x2 = 7 + -7

Combine like terms: -12 + -7 = -19
-19 + 11x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-19 + 11x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + 11x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + 11x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + 11x + x2 = 0 + 19
11x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
11x + x2 = 19

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 19 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 19 + 30.25

Combine like terms: 19 + 30.25 = 49.25
30.25 + 11x + x2 = 49.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 49.25

Calculate the square root of the right side: 7.017834424

Break this problem into two subproblems by setting 
(x + 5.5) equal to 7.017834424 and -7.017834424.

Subproblem 1

x + 5.5 = 7.017834424 Simplifying x + 5.5 = 7.017834424 Reorder the terms: 5.5 + x = 7.017834424 Solving 5.5 + x = 7.017834424 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 7.017834424 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 7.017834424 + -5.5 x = 7.017834424 + -5.5 Combine like terms: 7.017834424 + -5.5 = 1.517834424 x = 1.517834424 Simplifying x = 1.517834424

Subproblem 2

x + 5.5 = -7.017834424 Simplifying x + 5.5 = -7.017834424 Reorder the terms: 5.5 + x = -7.017834424 Solving 5.5 + x = -7.017834424 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -7.017834424 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -7.017834424 + -5.5 x = -7.017834424 + -5.5 Combine like terms: -7.017834424 + -5.5 = -12.517834424 x = -12.517834424 Simplifying x = -12.517834424

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.517834424, -12.517834424}

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