x(x-15)+(x+5)=15

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


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

Reorder the terms:
x(-15 + x) + (x + 5) = 15
(-15 * x + x * x) + (x + 5) = 15
(-15x + x2) + (x + 5) = 15

Reorder the terms:
-15x + x2 + (5 + x) = 15

Remove parenthesis around (5 + x)
-15x + x2 + 5 + x = 15

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

Combine like terms: -15x + x = -14x
5 + -14x + x2 = 15

Solving
5 + -14x + x2 = 15

Solving for variable 'x'.

Reorder the terms:
5 + -15 + -14x + x2 = 15 + -15

Combine like terms: 5 + -15 = -10
-10 + -14x + x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-10 + -14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -14x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + -14x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -14x + x2 = 0 + 10
-14x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
-14x + x2 = 10

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = 10 + 49

Reorder the terms:
49 + -14x + x2 = 10 + 49

Combine like terms: 10 + 49 = 59
49 + -14x + x2 = 59

Factor a perfect square on the left side:
(x + -7)(x + -7) = 59

Calculate the square root of the right side: 7.681145748

Break this problem into two subproblems by setting 
(x + -7) equal to 7.681145748 and -7.681145748.

Subproblem 1

x + -7 = 7.681145748 Simplifying x + -7 = 7.681145748 Reorder the terms: -7 + x = 7.681145748 Solving -7 + x = 7.681145748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 7.681145748 + 7 Combine like terms: -7 + 7 = 0 0 + x = 7.681145748 + 7 x = 7.681145748 + 7 Combine like terms: 7.681145748 + 7 = 14.681145748 x = 14.681145748 Simplifying x = 14.681145748

Subproblem 2

x + -7 = -7.681145748 Simplifying x + -7 = -7.681145748 Reorder the terms: -7 + x = -7.681145748 Solving -7 + x = -7.681145748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -7.681145748 + 7 Combine like terms: -7 + 7 = 0 0 + x = -7.681145748 + 7 x = -7.681145748 + 7 Combine like terms: -7.681145748 + 7 = -0.681145748 x = -0.681145748 Simplifying x = -0.681145748

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.681145748, -0.681145748}

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