6x(3x+7)=29

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Solution for 6x(3x+7)=29 equation:


Simplifying
6x(3x + 7) = 29

Reorder the terms:
6x(7 + 3x) = 29
(7 * 6x + 3x * 6x) = 29
(42x + 18x2) = 29

Solving
42x + 18x2 = 29

Solving for variable 'x'.

Reorder the terms:
-29 + 42x + 18x2 = 29 + -29

Combine like terms: 29 + -29 = 0
-29 + 42x + 18x2 = 0

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

Divide each side by '18'.
-1.611111111 + 2.333333333x + x2 = 0

Move the constant term to the right:

Add '1.611111111' to each side of the equation.
-1.611111111 + 2.333333333x + 1.611111111 + x2 = 0 + 1.611111111

Reorder the terms:
-1.611111111 + 1.611111111 + 2.333333333x + x2 = 0 + 1.611111111

Combine like terms: -1.611111111 + 1.611111111 = 0.000000000
0.000000000 + 2.333333333x + x2 = 0 + 1.611111111
2.333333333x + x2 = 0 + 1.611111111

Combine like terms: 0 + 1.611111111 = 1.611111111
2.333333333x + x2 = 1.611111111

The x term is 2.333333333x.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333x + 1.361111112 + x2 = 1.611111111 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333x + x2 = 1.611111111 + 1.361111112

Combine like terms: 1.611111111 + 1.361111112 = 2.972222223
1.361111112 + 2.333333333x + x2 = 2.972222223

Factor a perfect square on the left side:
(x + 1.166666667)(x + 1.166666667) = 2.972222223

Calculate the square root of the right side: 1.724013406

Break this problem into two subproblems by setting 
(x + 1.166666667) equal to 1.724013406 and -1.724013406.

Subproblem 1

x + 1.166666667 = 1.724013406 Simplifying x + 1.166666667 = 1.724013406 Reorder the terms: 1.166666667 + x = 1.724013406 Solving 1.166666667 + x = 1.724013406 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = 1.724013406 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = 1.724013406 + -1.166666667 x = 1.724013406 + -1.166666667 Combine like terms: 1.724013406 + -1.166666667 = 0.557346739 x = 0.557346739 Simplifying x = 0.557346739

Subproblem 2

x + 1.166666667 = -1.724013406 Simplifying x + 1.166666667 = -1.724013406 Reorder the terms: 1.166666667 + x = -1.724013406 Solving 1.166666667 + x = -1.724013406 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = -1.724013406 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = -1.724013406 + -1.166666667 x = -1.724013406 + -1.166666667 Combine like terms: -1.724013406 + -1.166666667 = -2.890680073 x = -2.890680073 Simplifying x = -2.890680073

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.557346739, -2.890680073}

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