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

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


Simplifying
5x(2x + 3) + -1(2x + -1) = 0

Reorder the terms:
5x(3 + 2x) + -1(2x + -1) = 0
(3 * 5x + 2x * 5x) + -1(2x + -1) = 0
(15x + 10x2) + -1(2x + -1) = 0

Reorder the terms:
15x + 10x2 + -1(-1 + 2x) = 0
15x + 10x2 + (-1 * -1 + 2x * -1) = 0
15x + 10x2 + (1 + -2x) = 0

Reorder the terms:
1 + 15x + -2x + 10x2 = 0

Combine like terms: 15x + -2x = 13x
1 + 13x + 10x2 = 0

Solving
1 + 13x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
0.1 + 1.3x + x2 = 0.0

Move the constant term to the right:

Add '-0.1' to each side of the equation.
0.1 + 1.3x + -0.1 + x2 = 0.0 + -0.1

Reorder the terms:
0.1 + -0.1 + 1.3x + x2 = 0.0 + -0.1

Combine like terms: 0.1 + -0.1 = 0.0
0.0 + 1.3x + x2 = 0.0 + -0.1
1.3x + x2 = 0.0 + -0.1

Combine like terms: 0.0 + -0.1 = -0.1
1.3x + x2 = -0.1

The x term is 1.3x.  Take half its coefficient (0.65).
Square it (0.4225) and add it to both sides.

Add '0.4225' to each side of the equation.
1.3x + 0.4225 + x2 = -0.1 + 0.4225

Reorder the terms:
0.4225 + 1.3x + x2 = -0.1 + 0.4225

Combine like terms: -0.1 + 0.4225 = 0.3225
0.4225 + 1.3x + x2 = 0.3225

Factor a perfect square on the left side:
(x + 0.65)(x + 0.65) = 0.3225

Calculate the square root of the right side: 0.567890835

Break this problem into two subproblems by setting 
(x + 0.65) equal to 0.567890835 and -0.567890835.

Subproblem 1

x + 0.65 = 0.567890835 Simplifying x + 0.65 = 0.567890835 Reorder the terms: 0.65 + x = 0.567890835 Solving 0.65 + x = 0.567890835 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.65' to each side of the equation. 0.65 + -0.65 + x = 0.567890835 + -0.65 Combine like terms: 0.65 + -0.65 = 0.00 0.00 + x = 0.567890835 + -0.65 x = 0.567890835 + -0.65 Combine like terms: 0.567890835 + -0.65 = -0.082109165 x = -0.082109165 Simplifying x = -0.082109165

Subproblem 2

x + 0.65 = -0.567890835 Simplifying x + 0.65 = -0.567890835 Reorder the terms: 0.65 + x = -0.567890835 Solving 0.65 + x = -0.567890835 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.65' to each side of the equation. 0.65 + -0.65 + x = -0.567890835 + -0.65 Combine like terms: 0.65 + -0.65 = 0.00 0.00 + x = -0.567890835 + -0.65 x = -0.567890835 + -0.65 Combine like terms: -0.567890835 + -0.65 = -1.217890835 x = -1.217890835 Simplifying x = -1.217890835

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.082109165, -1.217890835}

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