(x+3)(2x-5)=38

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Solution for (x+3)(2x-5)=38 equation:


Simplifying
(x + 3)(2x + -5) = 38

Reorder the terms:
(3 + x)(2x + -5) = 38

Reorder the terms:
(3 + x)(-5 + 2x) = 38

Multiply (3 + x) * (-5 + 2x)
(3(-5 + 2x) + x(-5 + 2x)) = 38
((-5 * 3 + 2x * 3) + x(-5 + 2x)) = 38
((-15 + 6x) + x(-5 + 2x)) = 38
(-15 + 6x + (-5 * x + 2x * x)) = 38
(-15 + 6x + (-5x + 2x2)) = 38

Combine like terms: 6x + -5x = 1x
(-15 + 1x + 2x2) = 38

Solving
-15 + 1x + 2x2 = 38

Solving for variable 'x'.

Reorder the terms:
-15 + -38 + 1x + 2x2 = 38 + -38

Combine like terms: -15 + -38 = -53
-53 + 1x + 2x2 = 38 + -38

Combine like terms: 38 + -38 = 0
-53 + 1x + 2x2 = 0

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

Divide each side by '2'.
-26.5 + 0.5x + x2 = 0

Move the constant term to the right:

Add '26.5' to each side of the equation.
-26.5 + 0.5x + 26.5 + x2 = 0 + 26.5

Reorder the terms:
-26.5 + 26.5 + 0.5x + x2 = 0 + 26.5

Combine like terms: -26.5 + 26.5 = 0.0
0.0 + 0.5x + x2 = 0 + 26.5
0.5x + x2 = 0 + 26.5

Combine like terms: 0 + 26.5 = 26.5
0.5x + x2 = 26.5

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 = 26.5 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 26.5 + 0.0625

Combine like terms: 26.5 + 0.0625 = 26.5625
0.0625 + 0.5x + x2 = 26.5625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 26.5625

Calculate the square root of the right side: 5.153882032

Break this problem into two subproblems by setting 
(x + 0.25) equal to 5.153882032 and -5.153882032.

Subproblem 1

x + 0.25 = 5.153882032 Simplifying x + 0.25 = 5.153882032 Reorder the terms: 0.25 + x = 5.153882032 Solving 0.25 + x = 5.153882032 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 = 5.153882032 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 5.153882032 + -0.25 x = 5.153882032 + -0.25 Combine like terms: 5.153882032 + -0.25 = 4.903882032 x = 4.903882032 Simplifying x = 4.903882032

Subproblem 2

x + 0.25 = -5.153882032 Simplifying x + 0.25 = -5.153882032 Reorder the terms: 0.25 + x = -5.153882032 Solving 0.25 + x = -5.153882032 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 = -5.153882032 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -5.153882032 + -0.25 x = -5.153882032 + -0.25 Combine like terms: -5.153882032 + -0.25 = -5.403882032 x = -5.403882032 Simplifying x = -5.403882032

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.903882032, -5.403882032}

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