(2x)(x+3)=55

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Solution for (2x)(x+3)=55 equation:


Simplifying
(2x)(x + 3) = 55

Remove parenthesis around (2x)
2x(x + 3) = 55

Reorder the terms:
2x(3 + x) = 55
(3 * 2x + x * 2x) = 55
(6x + 2x2) = 55

Solving
6x + 2x2 = 55

Solving for variable 'x'.

Reorder the terms:
-55 + 6x + 2x2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + 6x + 2x2 = 0

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

Divide each side by '2'.
-27.5 + 3x + x2 = 0

Move the constant term to the right:

Add '27.5' to each side of the equation.
-27.5 + 3x + 27.5 + x2 = 0 + 27.5

Reorder the terms:
-27.5 + 27.5 + 3x + x2 = 0 + 27.5

Combine like terms: -27.5 + 27.5 = 0.0
0.0 + 3x + x2 = 0 + 27.5
3x + x2 = 0 + 27.5

Combine like terms: 0 + 27.5 = 27.5
3x + x2 = 27.5

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 27.5 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 27.5 + 2.25

Combine like terms: 27.5 + 2.25 = 29.75
2.25 + 3x + x2 = 29.75

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 29.75

Calculate the square root of the right side: 5.454356057

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.454356057 and -5.454356057.

Subproblem 1

x + 1.5 = 5.454356057 Simplifying x + 1.5 = 5.454356057 Reorder the terms: 1.5 + x = 5.454356057 Solving 1.5 + x = 5.454356057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 5.454356057 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.454356057 + -1.5 x = 5.454356057 + -1.5 Combine like terms: 5.454356057 + -1.5 = 3.954356057 x = 3.954356057 Simplifying x = 3.954356057

Subproblem 2

x + 1.5 = -5.454356057 Simplifying x + 1.5 = -5.454356057 Reorder the terms: 1.5 + x = -5.454356057 Solving 1.5 + x = -5.454356057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -5.454356057 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.454356057 + -1.5 x = -5.454356057 + -1.5 Combine like terms: -5.454356057 + -1.5 = -6.954356057 x = -6.954356057 Simplifying x = -6.954356057

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.954356057, -6.954356057}

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