(x-5)(2x+4)=-3

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Solution for (x-5)(2x+4)=-3 equation:


Simplifying
(x + -5)(2x + 4) = -3

Reorder the terms:
(-5 + x)(2x + 4) = -3

Reorder the terms:
(-5 + x)(4 + 2x) = -3

Multiply (-5 + x) * (4 + 2x)
(-5(4 + 2x) + x(4 + 2x)) = -3
((4 * -5 + 2x * -5) + x(4 + 2x)) = -3
((-20 + -10x) + x(4 + 2x)) = -3
(-20 + -10x + (4 * x + 2x * x)) = -3
(-20 + -10x + (4x + 2x2)) = -3

Combine like terms: -10x + 4x = -6x
(-20 + -6x + 2x2) = -3

Solving
-20 + -6x + 2x2 = -3

Solving for variable 'x'.

Reorder the terms:
-20 + 3 + -6x + 2x2 = -3 + 3

Combine like terms: -20 + 3 = -17
-17 + -6x + 2x2 = -3 + 3

Combine like terms: -3 + 3 = 0
-17 + -6x + 2x2 = 0

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

Divide each side by '2'.
-8.5 + -3x + x2 = 0

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + -3x + 8.5 + x2 = 0 + 8.5

Reorder the terms:
-8.5 + 8.5 + -3x + x2 = 0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + -3x + x2 = 0 + 8.5
-3x + x2 = 0 + 8.5

Combine like terms: 0 + 8.5 = 8.5
-3x + x2 = 8.5

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 = 8.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 8.5 + 2.25

Combine like terms: 8.5 + 2.25 = 10.75
2.25 + -3x + x2 = 10.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 10.75

Calculate the square root of the right side: 3.278719262

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.278719262 and -3.278719262.

Subproblem 1

x + -1.5 = 3.278719262 Simplifying x + -1.5 = 3.278719262 Reorder the terms: -1.5 + x = 3.278719262 Solving -1.5 + x = 3.278719262 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 = 3.278719262 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.278719262 + 1.5 x = 3.278719262 + 1.5 Combine like terms: 3.278719262 + 1.5 = 4.778719262 x = 4.778719262 Simplifying x = 4.778719262

Subproblem 2

x + -1.5 = -3.278719262 Simplifying x + -1.5 = -3.278719262 Reorder the terms: -1.5 + x = -3.278719262 Solving -1.5 + x = -3.278719262 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 = -3.278719262 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.278719262 + 1.5 x = -3.278719262 + 1.5 Combine like terms: -3.278719262 + 1.5 = -1.778719262 x = -1.778719262 Simplifying x = -1.778719262

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.778719262, -1.778719262}

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