265=(x+5)(3x+5)

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Solution for 265=(x+5)(3x+5) equation:


Simplifying
265 = (x + 5)(3x + 5)

Reorder the terms:
265 = (5 + x)(3x + 5)

Reorder the terms:
265 = (5 + x)(5 + 3x)

Multiply (5 + x) * (5 + 3x)
265 = (5(5 + 3x) + x(5 + 3x))
265 = ((5 * 5 + 3x * 5) + x(5 + 3x))
265 = ((25 + 15x) + x(5 + 3x))
265 = (25 + 15x + (5 * x + 3x * x))
265 = (25 + 15x + (5x + 3x2))

Combine like terms: 15x + 5x = 20x
265 = (25 + 20x + 3x2)

Solving
265 = 25 + 20x + 3x2

Solving for variable 'x'.

Combine like terms: 265 + -25 = 240
240 + -20x + -3x2 = 25 + 20x + 3x2 + -25 + -20x + -3x2

Reorder the terms:
240 + -20x + -3x2 = 25 + -25 + 20x + -20x + 3x2 + -3x2

Combine like terms: 25 + -25 = 0
240 + -20x + -3x2 = 0 + 20x + -20x + 3x2 + -3x2
240 + -20x + -3x2 = 20x + -20x + 3x2 + -3x2

Combine like terms: 20x + -20x = 0
240 + -20x + -3x2 = 0 + 3x2 + -3x2
240 + -20x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
240 + -20x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-80 + 6.666666667x + x2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 6.666666667x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + 6.666666667x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 6.666666667x + x2 = 0 + 80
6.666666667x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
6.666666667x + x2 = 80

The x term is 6.666666667x.  Take half its coefficient (3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
6.666666667x + 11.11111112 + x2 = 80 + 11.11111112

Reorder the terms:
11.11111112 + 6.666666667x + x2 = 80 + 11.11111112

Combine like terms: 80 + 11.11111112 = 91.11111112
11.11111112 + 6.666666667x + x2 = 91.11111112

Factor a perfect square on the left side:
(x + 3.333333334)(x + 3.333333334) = 91.11111112

Calculate the square root of the right side: 9.545214043

Break this problem into two subproblems by setting 
(x + 3.333333334) equal to 9.545214043 and -9.545214043.

Subproblem 1

x + 3.333333334 = 9.545214043 Simplifying x + 3.333333334 = 9.545214043 Reorder the terms: 3.333333334 + x = 9.545214043 Solving 3.333333334 + x = 9.545214043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = 9.545214043 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = 9.545214043 + -3.333333334 x = 9.545214043 + -3.333333334 Combine like terms: 9.545214043 + -3.333333334 = 6.211880709 x = 6.211880709 Simplifying x = 6.211880709

Subproblem 2

x + 3.333333334 = -9.545214043 Simplifying x + 3.333333334 = -9.545214043 Reorder the terms: 3.333333334 + x = -9.545214043 Solving 3.333333334 + x = -9.545214043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = -9.545214043 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = -9.545214043 + -3.333333334 x = -9.545214043 + -3.333333334 Combine like terms: -9.545214043 + -3.333333334 = -12.878547377 x = -12.878547377 Simplifying x = -12.878547377

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.211880709, -12.878547377}

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