(x+-5)(x+3)=15

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Solution for (x+-5)(x+3)=15 equation:


Simplifying
(x + -5)(x + 3) = 15

Reorder the terms:
(-5 + x)(x + 3) = 15

Reorder the terms:
(-5 + x)(3 + x) = 15

Multiply (-5 + x) * (3 + x)
(-5(3 + x) + x(3 + x)) = 15
((3 * -5 + x * -5) + x(3 + x)) = 15
((-15 + -5x) + x(3 + x)) = 15
(-15 + -5x + (3 * x + x * x)) = 15
(-15 + -5x + (3x + x2)) = 15

Combine like terms: -5x + 3x = -2x
(-15 + -2x + x2) = 15

Solving
-15 + -2x + x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -15 + -2x + x2 = 15 + -15

Combine like terms: -15 + -15 = -30
-30 + -2x + x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-30 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -2x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + -2x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -2x + x2 = 0 + 30
-2x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
-2x + x2 = 30

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 30 + 1

Reorder the terms:
1 + -2x + x2 = 30 + 1

Combine like terms: 30 + 1 = 31
1 + -2x + x2 = 31

Factor a perfect square on the left side:
(x + -1)(x + -1) = 31

Calculate the square root of the right side: 5.567764363

Break this problem into two subproblems by setting 
(x + -1) equal to 5.567764363 and -5.567764363.

Subproblem 1

x + -1 = 5.567764363 Simplifying x + -1 = 5.567764363 Reorder the terms: -1 + x = 5.567764363 Solving -1 + x = 5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 5.567764363 + 1 Combine like terms: -1 + 1 = 0 0 + x = 5.567764363 + 1 x = 5.567764363 + 1 Combine like terms: 5.567764363 + 1 = 6.567764363 x = 6.567764363 Simplifying x = 6.567764363

Subproblem 2

x + -1 = -5.567764363 Simplifying x + -1 = -5.567764363 Reorder the terms: -1 + x = -5.567764363 Solving -1 + x = -5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -5.567764363 + 1 Combine like terms: -1 + 1 = 0 0 + x = -5.567764363 + 1 x = -5.567764363 + 1 Combine like terms: -5.567764363 + 1 = -4.567764363 x = -4.567764363 Simplifying x = -4.567764363

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.567764363, -4.567764363}

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