5x(x+2)+6=3

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Solution for 5x(x+2)+6=3 equation:


Simplifying
5x(x + 2) + 6 = 3

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

Reorder the terms:
6 + 10x + 5x2 = 3

Solving
6 + 10x + 5x2 = 3

Solving for variable 'x'.

Reorder the terms:
6 + -3 + 10x + 5x2 = 3 + -3

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

Combine like terms: 3 + -3 = 0
3 + 10x + 5x2 = 0

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

Divide each side by '5'.
0.6 + 2x + x2 = 0

Move the constant term to the right:

Add '-0.6' to each side of the equation.
0.6 + 2x + -0.6 + x2 = 0 + -0.6

Reorder the terms:
0.6 + -0.6 + 2x + x2 = 0 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + 2x + x2 = 0 + -0.6
2x + x2 = 0 + -0.6

Combine like terms: 0 + -0.6 = -0.6
2x + x2 = -0.6

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = -0.6 + 1

Reorder the terms:
1 + 2x + x2 = -0.6 + 1

Combine like terms: -0.6 + 1 = 0.4
1 + 2x + x2 = 0.4

Factor a perfect square on the left side:
(x + 1)(x + 1) = 0.4

Calculate the square root of the right side: 0.632455532

Break this problem into two subproblems by setting 
(x + 1) equal to 0.632455532 and -0.632455532.

Subproblem 1

x + 1 = 0.632455532 Simplifying x + 1 = 0.632455532 Reorder the terms: 1 + x = 0.632455532 Solving 1 + x = 0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0.632455532 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0.632455532 + -1 x = 0.632455532 + -1 Combine like terms: 0.632455532 + -1 = -0.367544468 x = -0.367544468 Simplifying x = -0.367544468

Subproblem 2

x + 1 = -0.632455532 Simplifying x + 1 = -0.632455532 Reorder the terms: 1 + x = -0.632455532 Solving 1 + x = -0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -0.632455532 + -1 Combine like terms: 1 + -1 = 0 0 + x = -0.632455532 + -1 x = -0.632455532 + -1 Combine like terms: -0.632455532 + -1 = -1.632455532 x = -1.632455532 Simplifying x = -1.632455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.367544468, -1.632455532}

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