(3x)*(2x+5)=1

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Solution for (3x)*(2x+5)=1 equation:


Simplifying
(3x)(2x + 5) = 1

Remove parenthesis around (3x)
3x(2x + 5) = 1

Reorder the terms:
3x(5 + 2x) = 1
(5 * 3x + 2x * 3x) = 1
(15x + 6x2) = 1

Solving
15x + 6x2 = 1

Solving for variable 'x'.

Reorder the terms:
-1 + 15x + 6x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 15x + 6x2 = 0

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

Divide each side by '6'.
-0.1666666667 + 2.5x + x2 = 0

Move the constant term to the right:

Add '0.1666666667' to each side of the equation.
-0.1666666667 + 2.5x + 0.1666666667 + x2 = 0 + 0.1666666667

Reorder the terms:
-0.1666666667 + 0.1666666667 + 2.5x + x2 = 0 + 0.1666666667

Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000
0.0000000000 + 2.5x + x2 = 0 + 0.1666666667
2.5x + x2 = 0 + 0.1666666667

Combine like terms: 0 + 0.1666666667 = 0.1666666667
2.5x + x2 = 0.1666666667

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 0.1666666667 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 0.1666666667 + 1.5625

Combine like terms: 0.1666666667 + 1.5625 = 1.7291666667
1.5625 + 2.5x + x2 = 1.7291666667

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 1.7291666667

Calculate the square root of the right side: 1.31497782

Break this problem into two subproblems by setting 
(x + 1.25) equal to 1.31497782 and -1.31497782.

Subproblem 1

x + 1.25 = 1.31497782 Simplifying x + 1.25 = 1.31497782 Reorder the terms: 1.25 + x = 1.31497782 Solving 1.25 + x = 1.31497782 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 1.31497782 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 1.31497782 + -1.25 x = 1.31497782 + -1.25 Combine like terms: 1.31497782 + -1.25 = 0.06497782 x = 0.06497782 Simplifying x = 0.06497782

Subproblem 2

x + 1.25 = -1.31497782 Simplifying x + 1.25 = -1.31497782 Reorder the terms: 1.25 + x = -1.31497782 Solving 1.25 + x = -1.31497782 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -1.31497782 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -1.31497782 + -1.25 x = -1.31497782 + -1.25 Combine like terms: -1.31497782 + -1.25 = -2.56497782 x = -2.56497782 Simplifying x = -2.56497782

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.06497782, -2.56497782}

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