(3x+7)(6x+3)=62

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Solution for (3x+7)(6x+3)=62 equation:


Simplifying
(3x + 7)(6x + 3) = 62

Reorder the terms:
(7 + 3x)(6x + 3) = 62

Reorder the terms:
(7 + 3x)(3 + 6x) = 62

Multiply (7 + 3x) * (3 + 6x)
(7(3 + 6x) + 3x * (3 + 6x)) = 62
((3 * 7 + 6x * 7) + 3x * (3 + 6x)) = 62
((21 + 42x) + 3x * (3 + 6x)) = 62
(21 + 42x + (3 * 3x + 6x * 3x)) = 62
(21 + 42x + (9x + 18x2)) = 62

Combine like terms: 42x + 9x = 51x
(21 + 51x + 18x2) = 62

Solving
21 + 51x + 18x2 = 62

Solving for variable 'x'.

Reorder the terms:
21 + -62 + 51x + 18x2 = 62 + -62

Combine like terms: 21 + -62 = -41
-41 + 51x + 18x2 = 62 + -62

Combine like terms: 62 + -62 = 0
-41 + 51x + 18x2 = 0

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

Divide each side by '18'.
-2.277777778 + 2.833333333x + x2 = 0

Move the constant term to the right:

Add '2.277777778' to each side of the equation.
-2.277777778 + 2.833333333x + 2.277777778 + x2 = 0 + 2.277777778

Reorder the terms:
-2.277777778 + 2.277777778 + 2.833333333x + x2 = 0 + 2.277777778

Combine like terms: -2.277777778 + 2.277777778 = 0.000000000
0.000000000 + 2.833333333x + x2 = 0 + 2.277777778
2.833333333x + x2 = 0 + 2.277777778

Combine like terms: 0 + 2.277777778 = 2.277777778
2.833333333x + x2 = 2.277777778

The x term is 2.833333333x.  Take half its coefficient (1.416666667).
Square it (2.006944445) and add it to both sides.

Add '2.006944445' to each side of the equation.
2.833333333x + 2.006944445 + x2 = 2.277777778 + 2.006944445

Reorder the terms:
2.006944445 + 2.833333333x + x2 = 2.277777778 + 2.006944445

Combine like terms: 2.277777778 + 2.006944445 = 4.284722223
2.006944445 + 2.833333333x + x2 = 4.284722223

Factor a perfect square on the left side:
(x + 1.416666667)(x + 1.416666667) = 4.284722223

Calculate the square root of the right side: 2.069957058

Break this problem into two subproblems by setting 
(x + 1.416666667) equal to 2.069957058 and -2.069957058.

Subproblem 1

x + 1.416666667 = 2.069957058 Simplifying x + 1.416666667 = 2.069957058 Reorder the terms: 1.416666667 + x = 2.069957058 Solving 1.416666667 + x = 2.069957058 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.416666667' to each side of the equation. 1.416666667 + -1.416666667 + x = 2.069957058 + -1.416666667 Combine like terms: 1.416666667 + -1.416666667 = 0.000000000 0.000000000 + x = 2.069957058 + -1.416666667 x = 2.069957058 + -1.416666667 Combine like terms: 2.069957058 + -1.416666667 = 0.653290391 x = 0.653290391 Simplifying x = 0.653290391

Subproblem 2

x + 1.416666667 = -2.069957058 Simplifying x + 1.416666667 = -2.069957058 Reorder the terms: 1.416666667 + x = -2.069957058 Solving 1.416666667 + x = -2.069957058 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.416666667' to each side of the equation. 1.416666667 + -1.416666667 + x = -2.069957058 + -1.416666667 Combine like terms: 1.416666667 + -1.416666667 = 0.000000000 0.000000000 + x = -2.069957058 + -1.416666667 x = -2.069957058 + -1.416666667 Combine like terms: -2.069957058 + -1.416666667 = -3.486623725 x = -3.486623725 Simplifying x = -3.486623725

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.653290391, -3.486623725}

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