(2x-5)(x+3)=22

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Solution for (2x-5)(x+3)=22 equation:


Simplifying
(2x + -5)(x + 3) = 22

Reorder the terms:
(-5 + 2x)(x + 3) = 22

Reorder the terms:
(-5 + 2x)(3 + x) = 22

Multiply (-5 + 2x) * (3 + x)
(-5(3 + x) + 2x * (3 + x)) = 22
((3 * -5 + x * -5) + 2x * (3 + x)) = 22
((-15 + -5x) + 2x * (3 + x)) = 22
(-15 + -5x + (3 * 2x + x * 2x)) = 22
(-15 + -5x + (6x + 2x2)) = 22

Combine like terms: -5x + 6x = 1x
(-15 + 1x + 2x2) = 22

Solving
-15 + 1x + 2x2 = 22

Solving for variable 'x'.

Reorder the terms:
-15 + -22 + 1x + 2x2 = 22 + -22

Combine like terms: -15 + -22 = -37
-37 + 1x + 2x2 = 22 + -22

Combine like terms: 22 + -22 = 0
-37 + 1x + 2x2 = 0

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

Divide each side by '2'.
-18.5 + 0.5x + x2 = 0

Move the constant term to the right:

Add '18.5' to each side of the equation.
-18.5 + 0.5x + 18.5 + x2 = 0 + 18.5

Reorder the terms:
-18.5 + 18.5 + 0.5x + x2 = 0 + 18.5

Combine like terms: -18.5 + 18.5 = 0.0
0.0 + 0.5x + x2 = 0 + 18.5
0.5x + x2 = 0 + 18.5

Combine like terms: 0 + 18.5 = 18.5
0.5x + x2 = 18.5

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 18.5 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 18.5 + 0.0625

Combine like terms: 18.5 + 0.0625 = 18.5625
0.0625 + 0.5x + x2 = 18.5625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 18.5625

Calculate the square root of the right side: 4.308421985

Break this problem into two subproblems by setting 
(x + 0.25) equal to 4.308421985 and -4.308421985.

Subproblem 1

x + 0.25 = 4.308421985 Simplifying x + 0.25 = 4.308421985 Reorder the terms: 0.25 + x = 4.308421985 Solving 0.25 + x = 4.308421985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 4.308421985 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 4.308421985 + -0.25 x = 4.308421985 + -0.25 Combine like terms: 4.308421985 + -0.25 = 4.058421985 x = 4.058421985 Simplifying x = 4.058421985

Subproblem 2

x + 0.25 = -4.308421985 Simplifying x + 0.25 = -4.308421985 Reorder the terms: 0.25 + x = -4.308421985 Solving 0.25 + x = -4.308421985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -4.308421985 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -4.308421985 + -0.25 x = -4.308421985 + -0.25 Combine like terms: -4.308421985 + -0.25 = -4.558421985 x = -4.558421985 Simplifying x = -4.558421985

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.058421985, -4.558421985}

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