3x(2x+1)=17

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Solution for 3x(2x+1)=17 equation:


Simplifying
3x(2x + 1) = 17

Reorder the terms:
3x(1 + 2x) = 17
(1 * 3x + 2x * 3x) = 17
(3x + 6x2) = 17

Solving
3x + 6x2 = 17

Solving for variable 'x'.

Reorder the terms:
-17 + 3x + 6x2 = 17 + -17

Combine like terms: 17 + -17 = 0
-17 + 3x + 6x2 = 0

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

Divide each side by '6'.
-2.833333333 + 0.5x + x2 = 0

Move the constant term to the right:

Add '2.833333333' to each side of the equation.
-2.833333333 + 0.5x + 2.833333333 + x2 = 0 + 2.833333333

Reorder the terms:
-2.833333333 + 2.833333333 + 0.5x + x2 = 0 + 2.833333333

Combine like terms: -2.833333333 + 2.833333333 = 0.000000000
0.000000000 + 0.5x + x2 = 0 + 2.833333333
0.5x + x2 = 0 + 2.833333333

Combine like terms: 0 + 2.833333333 = 2.833333333
0.5x + x2 = 2.833333333

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 2.833333333 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 2.833333333 + 0.0625

Combine like terms: 2.833333333 + 0.0625 = 2.895833333
0.0625 + 0.5x + x2 = 2.895833333

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 2.895833333

Calculate the square root of the right side: 1.701714821

Break this problem into two subproblems by setting 
(x + 0.25) equal to 1.701714821 and -1.701714821.

Subproblem 1

x + 0.25 = 1.701714821 Simplifying x + 0.25 = 1.701714821 Reorder the terms: 0.25 + x = 1.701714821 Solving 0.25 + x = 1.701714821 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 1.701714821 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 1.701714821 + -0.25 x = 1.701714821 + -0.25 Combine like terms: 1.701714821 + -0.25 = 1.451714821 x = 1.451714821 Simplifying x = 1.451714821

Subproblem 2

x + 0.25 = -1.701714821 Simplifying x + 0.25 = -1.701714821 Reorder the terms: 0.25 + x = -1.701714821 Solving 0.25 + x = -1.701714821 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -1.701714821 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -1.701714821 + -0.25 x = -1.701714821 + -0.25 Combine like terms: -1.701714821 + -0.25 = -1.951714821 x = -1.951714821 Simplifying x = -1.951714821

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.451714821, -1.951714821}

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