(x+1)(x+15)=5x

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Solution for (x+1)(x+15)=5x equation:


Simplifying
(x + 1)(x + 15) = 5x

Reorder the terms:
(1 + x)(x + 15) = 5x

Reorder the terms:
(1 + x)(15 + x) = 5x

Multiply (1 + x) * (15 + x)
(1(15 + x) + x(15 + x)) = 5x
((15 * 1 + x * 1) + x(15 + x)) = 5x
((15 + 1x) + x(15 + x)) = 5x
(15 + 1x + (15 * x + x * x)) = 5x
(15 + 1x + (15x + x2)) = 5x

Combine like terms: 1x + 15x = 16x
(15 + 16x + x2) = 5x

Solving
15 + 16x + x2 = 5x

Solving for variable 'x'.

Reorder the terms:
15 + 16x + -5x + x2 = 5x + -5x

Combine like terms: 16x + -5x = 11x
15 + 11x + x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
15 + 11x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + 11x + -15 + x2 = 0 + -15

Reorder the terms:
15 + -15 + 11x + x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 11x + x2 = 0 + -15
11x + x2 = 0 + -15

Combine like terms: 0 + -15 = -15
11x + x2 = -15

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 = -15 + 30.25

Reorder the terms:
30.25 + 11x + x2 = -15 + 30.25

Combine like terms: -15 + 30.25 = 15.25
30.25 + 11x + x2 = 15.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 15.25

Calculate the square root of the right side: 3.905124838

Break this problem into two subproblems by setting 
(x + 5.5) equal to 3.905124838 and -3.905124838.

Subproblem 1

x + 5.5 = 3.905124838 Simplifying x + 5.5 = 3.905124838 Reorder the terms: 5.5 + x = 3.905124838 Solving 5.5 + x = 3.905124838 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 = 3.905124838 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 3.905124838 + -5.5 x = 3.905124838 + -5.5 Combine like terms: 3.905124838 + -5.5 = -1.594875162 x = -1.594875162 Simplifying x = -1.594875162

Subproblem 2

x + 5.5 = -3.905124838 Simplifying x + 5.5 = -3.905124838 Reorder the terms: 5.5 + x = -3.905124838 Solving 5.5 + x = -3.905124838 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 = -3.905124838 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -3.905124838 + -5.5 x = -3.905124838 + -5.5 Combine like terms: -3.905124838 + -5.5 = -9.405124838 x = -9.405124838 Simplifying x = -9.405124838

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.594875162, -9.405124838}

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