(x+7)(x-2)=118

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Solution for (x+7)(x-2)=118 equation:


Simplifying
(x + 7)(x + -2) = 118

Reorder the terms:
(7 + x)(x + -2) = 118

Reorder the terms:
(7 + x)(-2 + x) = 118

Multiply (7 + x) * (-2 + x)
(7(-2 + x) + x(-2 + x)) = 118
((-2 * 7 + x * 7) + x(-2 + x)) = 118
((-14 + 7x) + x(-2 + x)) = 118
(-14 + 7x + (-2 * x + x * x)) = 118
(-14 + 7x + (-2x + x2)) = 118

Combine like terms: 7x + -2x = 5x
(-14 + 5x + x2) = 118

Solving
-14 + 5x + x2 = 118

Solving for variable 'x'.

Reorder the terms:
-14 + -118 + 5x + x2 = 118 + -118

Combine like terms: -14 + -118 = -132
-132 + 5x + x2 = 118 + -118

Combine like terms: 118 + -118 = 0
-132 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '132' to each side of the equation.
-132 + 5x + 132 + x2 = 0 + 132

Reorder the terms:
-132 + 132 + 5x + x2 = 0 + 132

Combine like terms: -132 + 132 = 0
0 + 5x + x2 = 0 + 132
5x + x2 = 0 + 132

Combine like terms: 0 + 132 = 132
5x + x2 = 132

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 132 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 132 + 6.25

Combine like terms: 132 + 6.25 = 138.25
6.25 + 5x + x2 = 138.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 138.25

Calculate the square root of the right side: 11.757976016

Break this problem into two subproblems by setting 
(x + 2.5) equal to 11.757976016 and -11.757976016.

Subproblem 1

x + 2.5 = 11.757976016 Simplifying x + 2.5 = 11.757976016 Reorder the terms: 2.5 + x = 11.757976016 Solving 2.5 + x = 11.757976016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 11.757976016 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 11.757976016 + -2.5 x = 11.757976016 + -2.5 Combine like terms: 11.757976016 + -2.5 = 9.257976016 x = 9.257976016 Simplifying x = 9.257976016

Subproblem 2

x + 2.5 = -11.757976016 Simplifying x + 2.5 = -11.757976016 Reorder the terms: 2.5 + x = -11.757976016 Solving 2.5 + x = -11.757976016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -11.757976016 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -11.757976016 + -2.5 x = -11.757976016 + -2.5 Combine like terms: -11.757976016 + -2.5 = -14.257976016 x = -14.257976016 Simplifying x = -14.257976016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.257976016, -14.257976016}

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