(x-5)(x+16)=12

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Solution for (x-5)(x+16)=12 equation:


Simplifying
(x + -5)(x + 16) = 12

Reorder the terms:
(-5 + x)(x + 16) = 12

Reorder the terms:
(-5 + x)(16 + x) = 12

Multiply (-5 + x) * (16 + x)
(-5(16 + x) + x(16 + x)) = 12
((16 * -5 + x * -5) + x(16 + x)) = 12
((-80 + -5x) + x(16 + x)) = 12
(-80 + -5x + (16 * x + x * x)) = 12
(-80 + -5x + (16x + x2)) = 12

Combine like terms: -5x + 16x = 11x
(-80 + 11x + x2) = 12

Solving
-80 + 11x + x2 = 12

Solving for variable 'x'.

Reorder the terms:
-80 + -12 + 11x + x2 = 12 + -12

Combine like terms: -80 + -12 = -92
-92 + 11x + x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-92 + 11x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '92' to each side of the equation.
-92 + 11x + 92 + x2 = 0 + 92

Reorder the terms:
-92 + 92 + 11x + x2 = 0 + 92

Combine like terms: -92 + 92 = 0
0 + 11x + x2 = 0 + 92
11x + x2 = 0 + 92

Combine like terms: 0 + 92 = 92
11x + x2 = 92

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 = 92 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 92 + 30.25

Combine like terms: 92 + 30.25 = 122.25
30.25 + 11x + x2 = 122.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 122.25

Calculate the square root of the right side: 11.056672194

Break this problem into two subproblems by setting 
(x + 5.5) equal to 11.056672194 and -11.056672194.

Subproblem 1

x + 5.5 = 11.056672194 Simplifying x + 5.5 = 11.056672194 Reorder the terms: 5.5 + x = 11.056672194 Solving 5.5 + x = 11.056672194 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 = 11.056672194 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 11.056672194 + -5.5 x = 11.056672194 + -5.5 Combine like terms: 11.056672194 + -5.5 = 5.556672194 x = 5.556672194 Simplifying x = 5.556672194

Subproblem 2

x + 5.5 = -11.056672194 Simplifying x + 5.5 = -11.056672194 Reorder the terms: 5.5 + x = -11.056672194 Solving 5.5 + x = -11.056672194 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 = -11.056672194 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -11.056672194 + -5.5 x = -11.056672194 + -5.5 Combine like terms: -11.056672194 + -5.5 = -16.556672194 x = -16.556672194 Simplifying x = -16.556672194

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.556672194, -16.556672194}

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