2x(3x+5)+5=8

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Solution for 2x(3x+5)+5=8 equation:


Simplifying
2x(3x + 5) + 5 = 8

Reorder the terms:
2x(5 + 3x) + 5 = 8
(5 * 2x + 3x * 2x) + 5 = 8
(10x + 6x2) + 5 = 8

Reorder the terms:
5 + 10x + 6x2 = 8

Solving
5 + 10x + 6x2 = 8

Solving for variable 'x'.

Reorder the terms:
5 + -8 + 10x + 6x2 = 8 + -8

Combine like terms: 5 + -8 = -3
-3 + 10x + 6x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-3 + 10x + 6x2 = 0

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

Divide each side by '6'.
-0.5 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 1.666666667x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 1.666666667x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 1.666666667x + x2 = 0 + 0.5
1.666666667x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
1.666666667x + x2 = 0.5

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 0.5 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 0.5 + 0.6944444447

Combine like terms: 0.5 + 0.6944444447 = 1.1944444447
0.6944444447 + 1.666666667x + x2 = 1.1944444447

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 1.1944444447

Calculate the square root of the right side: 1.092906421

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 1.092906421 and -1.092906421.

Subproblem 1

x + 0.8333333335 = 1.092906421 Simplifying x + 0.8333333335 = 1.092906421 Reorder the terms: 0.8333333335 + x = 1.092906421 Solving 0.8333333335 + x = 1.092906421 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = 1.092906421 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = 1.092906421 + -0.8333333335 x = 1.092906421 + -0.8333333335 Combine like terms: 1.092906421 + -0.8333333335 = 0.2595730875 x = 0.2595730875 Simplifying x = 0.2595730875

Subproblem 2

x + 0.8333333335 = -1.092906421 Simplifying x + 0.8333333335 = -1.092906421 Reorder the terms: 0.8333333335 + x = -1.092906421 Solving 0.8333333335 + x = -1.092906421 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = -1.092906421 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = -1.092906421 + -0.8333333335 x = -1.092906421 + -0.8333333335 Combine like terms: -1.092906421 + -0.8333333335 = -1.9262397545 x = -1.9262397545 Simplifying x = -1.9262397545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2595730875, -1.9262397545}

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