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

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


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

Reorder the terms:
5(3 + x) + -2x(x + 3) = 2x
(3 * 5 + x * 5) + -2x(x + 3) = 2x
(15 + 5x) + -2x(x + 3) = 2x

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

Combine like terms: 5x + -6x = -1x
15 + -1x + -2x2 = 2x

Solving
15 + -1x + -2x2 = 2x

Solving for variable 'x'.

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

Combine like terms: -1x + -2x = -3x
15 + -3x + -2x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
15 + -3x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-7.5 + 1.5x + x2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + 1.5x + 7.5 + x2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + 1.5x + x2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + 1.5x + x2 = 0 + 7.5
1.5x + x2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
1.5x + x2 = 7.5

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 7.5 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 7.5 + 0.5625

Combine like terms: 7.5 + 0.5625 = 8.0625
0.5625 + 1.5x + x2 = 8.0625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 8.0625

Calculate the square root of the right side: 2.839454173

Break this problem into two subproblems by setting 
(x + 0.75) equal to 2.839454173 and -2.839454173.

Subproblem 1

x + 0.75 = 2.839454173 Simplifying x + 0.75 = 2.839454173 Reorder the terms: 0.75 + x = 2.839454173 Solving 0.75 + x = 2.839454173 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 2.839454173 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 2.839454173 + -0.75 x = 2.839454173 + -0.75 Combine like terms: 2.839454173 + -0.75 = 2.089454173 x = 2.089454173 Simplifying x = 2.089454173

Subproblem 2

x + 0.75 = -2.839454173 Simplifying x + 0.75 = -2.839454173 Reorder the terms: 0.75 + x = -2.839454173 Solving 0.75 + x = -2.839454173 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -2.839454173 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -2.839454173 + -0.75 x = -2.839454173 + -0.75 Combine like terms: -2.839454173 + -0.75 = -3.589454173 x = -3.589454173 Simplifying x = -3.589454173

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.089454173, -3.589454173}

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