2x(x+3)-7=5(5-x)+(x+1)

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Solution for 2x(x+3)-7=5(5-x)+(x+1) equation:


Simplifying
2x(x + 3) + -7 = 5(5 + -1x) + (x + 1)

Reorder the terms:
2x(3 + x) + -7 = 5(5 + -1x) + (x + 1)
(3 * 2x + x * 2x) + -7 = 5(5 + -1x) + (x + 1)
(6x + 2x2) + -7 = 5(5 + -1x) + (x + 1)

Reorder the terms:
-7 + 6x + 2x2 = 5(5 + -1x) + (x + 1)
-7 + 6x + 2x2 = (5 * 5 + -1x * 5) + (x + 1)
-7 + 6x + 2x2 = (25 + -5x) + (x + 1)

Reorder the terms:
-7 + 6x + 2x2 = 25 + -5x + (1 + x)

Remove parenthesis around (1 + x)
-7 + 6x + 2x2 = 25 + -5x + 1 + x

Reorder the terms:
-7 + 6x + 2x2 = 25 + 1 + -5x + x

Combine like terms: 25 + 1 = 26
-7 + 6x + 2x2 = 26 + -5x + x

Combine like terms: -5x + x = -4x
-7 + 6x + 2x2 = 26 + -4x

Solving
-7 + 6x + 2x2 = 26 + -4x

Solving for variable 'x'.

Reorder the terms:
-7 + -26 + 6x + 4x + 2x2 = 26 + -4x + -26 + 4x

Combine like terms: -7 + -26 = -33
-33 + 6x + 4x + 2x2 = 26 + -4x + -26 + 4x

Combine like terms: 6x + 4x = 10x
-33 + 10x + 2x2 = 26 + -4x + -26 + 4x

Reorder the terms:
-33 + 10x + 2x2 = 26 + -26 + -4x + 4x

Combine like terms: 26 + -26 = 0
-33 + 10x + 2x2 = 0 + -4x + 4x
-33 + 10x + 2x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-33 + 10x + 2x2 = 0

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

Divide each side by '2'.
-16.5 + 5x + x2 = 0

Move the constant term to the right:

Add '16.5' to each side of the equation.
-16.5 + 5x + 16.5 + x2 = 0 + 16.5

Reorder the terms:
-16.5 + 16.5 + 5x + x2 = 0 + 16.5

Combine like terms: -16.5 + 16.5 = 0.0
0.0 + 5x + x2 = 0 + 16.5
5x + x2 = 0 + 16.5

Combine like terms: 0 + 16.5 = 16.5
5x + x2 = 16.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 16.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 16.5 + 6.25

Combine like terms: 16.5 + 6.25 = 22.75
6.25 + 5x + x2 = 22.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 22.75

Calculate the square root of the right side: 4.769696007

Break this problem into two subproblems by setting 
(x + 2.5) equal to 4.769696007 and -4.769696007.

Subproblem 1

x + 2.5 = 4.769696007 Simplifying x + 2.5 = 4.769696007 Reorder the terms: 2.5 + x = 4.769696007 Solving 2.5 + x = 4.769696007 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 4.769696007 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 4.769696007 + -2.5 x = 4.769696007 + -2.5 Combine like terms: 4.769696007 + -2.5 = 2.269696007 x = 2.269696007 Simplifying x = 2.269696007

Subproblem 2

x + 2.5 = -4.769696007 Simplifying x + 2.5 = -4.769696007 Reorder the terms: 2.5 + x = -4.769696007 Solving 2.5 + x = -4.769696007 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -4.769696007 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -4.769696007 + -2.5 x = -4.769696007 + -2.5 Combine like terms: -4.769696007 + -2.5 = -7.269696007 x = -7.269696007 Simplifying x = -7.269696007

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.269696007, -7.269696007}

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