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

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


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

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

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

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

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

Solving
-15 + 1x + 2x2 = 5

Solving for variable 'x'.

Reorder the terms:
-15 + -5 + 1x + 2x2 = 5 + -5

Combine like terms: -15 + -5 = -20
-20 + 1x + 2x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-20 + 1x + 2x2 = 0

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

Divide each side by '2'.
-10 + 0.5x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 0.5x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + 0.5x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 0.5x + x2 = 0 + 10
0.5x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
0.5x + x2 = 10

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 = 10 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 10 + 0.0625

Combine like terms: 10 + 0.0625 = 10.0625
0.0625 + 0.5x + x2 = 10.0625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 10.0625

Calculate the square root of the right side: 3.172144385

Break this problem into two subproblems by setting 
(x + 0.25) equal to 3.172144385 and -3.172144385.

Subproblem 1

x + 0.25 = 3.172144385 Simplifying x + 0.25 = 3.172144385 Reorder the terms: 0.25 + x = 3.172144385 Solving 0.25 + x = 3.172144385 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 = 3.172144385 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 3.172144385 + -0.25 x = 3.172144385 + -0.25 Combine like terms: 3.172144385 + -0.25 = 2.922144385 x = 2.922144385 Simplifying x = 2.922144385

Subproblem 2

x + 0.25 = -3.172144385 Simplifying x + 0.25 = -3.172144385 Reorder the terms: 0.25 + x = -3.172144385 Solving 0.25 + x = -3.172144385 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 = -3.172144385 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -3.172144385 + -0.25 x = -3.172144385 + -0.25 Combine like terms: -3.172144385 + -0.25 = -3.422144385 x = -3.422144385 Simplifying x = -3.422144385

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.922144385, -3.422144385}

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