(3x+6)(3x+10)=64

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Solution for (3x+6)(3x+10)=64 equation:


Simplifying
(3x + 6)(3x + 10) = 64

Reorder the terms:
(6 + 3x)(3x + 10) = 64

Reorder the terms:
(6 + 3x)(10 + 3x) = 64

Multiply (6 + 3x) * (10 + 3x)
(6(10 + 3x) + 3x * (10 + 3x)) = 64
((10 * 6 + 3x * 6) + 3x * (10 + 3x)) = 64
((60 + 18x) + 3x * (10 + 3x)) = 64
(60 + 18x + (10 * 3x + 3x * 3x)) = 64
(60 + 18x + (30x + 9x2)) = 64

Combine like terms: 18x + 30x = 48x
(60 + 48x + 9x2) = 64

Solving
60 + 48x + 9x2 = 64

Solving for variable 'x'.

Reorder the terms:
60 + -64 + 48x + 9x2 = 64 + -64

Combine like terms: 60 + -64 = -4
-4 + 48x + 9x2 = 64 + -64

Combine like terms: 64 + -64 = 0
-4 + 48x + 9x2 = 0

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

Divide each side by '9'.
-0.4444444444 + 5.333333333x + x2 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + 5.333333333x + 0.4444444444 + x2 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + 5.333333333x + x2 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + 5.333333333x + x2 = 0 + 0.4444444444
5.333333333x + x2 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
5.333333333x + x2 = 0.4444444444

The x term is 5.333333333x.  Take half its coefficient (2.666666667).
Square it (7.111111113) and add it to both sides.

Add '7.111111113' to each side of the equation.
5.333333333x + 7.111111113 + x2 = 0.4444444444 + 7.111111113

Reorder the terms:
7.111111113 + 5.333333333x + x2 = 0.4444444444 + 7.111111113

Combine like terms: 0.4444444444 + 7.111111113 = 7.5555555574
7.111111113 + 5.333333333x + x2 = 7.5555555574

Factor a perfect square on the left side:
(x + 2.666666667)(x + 2.666666667) = 7.5555555574

Calculate the square root of the right side: 2.748737084

Break this problem into two subproblems by setting 
(x + 2.666666667) equal to 2.748737084 and -2.748737084.

Subproblem 1

x + 2.666666667 = 2.748737084 Simplifying x + 2.666666667 = 2.748737084 Reorder the terms: 2.666666667 + x = 2.748737084 Solving 2.666666667 + x = 2.748737084 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.666666667' to each side of the equation. 2.666666667 + -2.666666667 + x = 2.748737084 + -2.666666667 Combine like terms: 2.666666667 + -2.666666667 = 0.000000000 0.000000000 + x = 2.748737084 + -2.666666667 x = 2.748737084 + -2.666666667 Combine like terms: 2.748737084 + -2.666666667 = 0.082070417 x = 0.082070417 Simplifying x = 0.082070417

Subproblem 2

x + 2.666666667 = -2.748737084 Simplifying x + 2.666666667 = -2.748737084 Reorder the terms: 2.666666667 + x = -2.748737084 Solving 2.666666667 + x = -2.748737084 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.666666667' to each side of the equation. 2.666666667 + -2.666666667 + x = -2.748737084 + -2.666666667 Combine like terms: 2.666666667 + -2.666666667 = 0.000000000 0.000000000 + x = -2.748737084 + -2.666666667 x = -2.748737084 + -2.666666667 Combine like terms: -2.748737084 + -2.666666667 = -5.415403751 x = -5.415403751 Simplifying x = -5.415403751

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.082070417, -5.415403751}

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