(x+10)(3x+10)=64

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Solution for (x+10)(3x+10)=64 equation:


Simplifying
(x + 10)(3x + 10) = 64

Reorder the terms:
(10 + x)(3x + 10) = 64

Reorder the terms:
(10 + x)(10 + 3x) = 64

Multiply (10 + x) * (10 + 3x)
(10(10 + 3x) + x(10 + 3x)) = 64
((10 * 10 + 3x * 10) + x(10 + 3x)) = 64
((100 + 30x) + x(10 + 3x)) = 64
(100 + 30x + (10 * x + 3x * x)) = 64
(100 + 30x + (10x + 3x2)) = 64

Combine like terms: 30x + 10x = 40x
(100 + 40x + 3x2) = 64

Solving
100 + 40x + 3x2 = 64

Solving for variable 'x'.

Reorder the terms:
100 + -64 + 40x + 3x2 = 64 + -64

Combine like terms: 100 + -64 = 36
36 + 40x + 3x2 = 64 + -64

Combine like terms: 64 + -64 = 0
36 + 40x + 3x2 = 0

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

Divide each side by '3'.
12 + 13.33333333x + x2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + 13.33333333x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + 13.33333333x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 13.33333333x + x2 = 0 + -12
13.33333333x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
13.33333333x + x2 = -12

The x term is 13.33333333x.  Take half its coefficient (6.666666665).
Square it (44.44444442) and add it to both sides.

Add '44.44444442' to each side of the equation.
13.33333333x + 44.44444442 + x2 = -12 + 44.44444442

Reorder the terms:
44.44444442 + 13.33333333x + x2 = -12 + 44.44444442

Combine like terms: -12 + 44.44444442 = 32.44444442
44.44444442 + 13.33333333x + x2 = 32.44444442

Factor a perfect square on the left side:
(x + 6.666666665)(x + 6.666666665) = 32.44444442

Calculate the square root of the right side: 5.696002495

Break this problem into two subproblems by setting 
(x + 6.666666665) equal to 5.696002495 and -5.696002495.

Subproblem 1

x + 6.666666665 = 5.696002495 Simplifying x + 6.666666665 = 5.696002495 Reorder the terms: 6.666666665 + x = 5.696002495 Solving 6.666666665 + x = 5.696002495 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.666666665' to each side of the equation. 6.666666665 + -6.666666665 + x = 5.696002495 + -6.666666665 Combine like terms: 6.666666665 + -6.666666665 = 0.000000000 0.000000000 + x = 5.696002495 + -6.666666665 x = 5.696002495 + -6.666666665 Combine like terms: 5.696002495 + -6.666666665 = -0.97066417 x = -0.97066417 Simplifying x = -0.97066417

Subproblem 2

x + 6.666666665 = -5.696002495 Simplifying x + 6.666666665 = -5.696002495 Reorder the terms: 6.666666665 + x = -5.696002495 Solving 6.666666665 + x = -5.696002495 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.666666665' to each side of the equation. 6.666666665 + -6.666666665 + x = -5.696002495 + -6.666666665 Combine like terms: 6.666666665 + -6.666666665 = 0.000000000 0.000000000 + x = -5.696002495 + -6.666666665 x = -5.696002495 + -6.666666665 Combine like terms: -5.696002495 + -6.666666665 = -12.36266916 x = -12.36266916 Simplifying x = -12.36266916

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.97066417, -12.36266916}

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