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

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


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

Reorder the terms:
(-5 + 2x)(x + 1) = 5

Reorder the terms:
(-5 + 2x)(1 + x) = 5

Multiply (-5 + 2x) * (1 + x)
(-5(1 + x) + 2x * (1 + x)) = 5
((1 * -5 + x * -5) + 2x * (1 + x)) = 5
((-5 + -5x) + 2x * (1 + x)) = 5
(-5 + -5x + (1 * 2x + x * 2x)) = 5
(-5 + -5x + (2x + 2x2)) = 5

Combine like terms: -5x + 2x = -3x
(-5 + -3x + 2x2) = 5

Solving
-5 + -3x + 2x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + -5 + -3x + 2x2 = 5 + -5

Combine like terms: -5 + -5 = -10
-10 + -3x + 2x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-10 + -3x + 2x2 = 0

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

Divide each side by '2'.
-5 + -1.5x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -1.5x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -1.5x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1.5x + x2 = 0 + 5
-1.5x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-1.5x + x2 = 5

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 5 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 5 + 0.5625

Combine like terms: 5 + 0.5625 = 5.5625
0.5625 + -1.5x + x2 = 5.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 5.5625

Calculate the square root of the right side: 2.358495283

Break this problem into two subproblems by setting 
(x + -0.75) equal to 2.358495283 and -2.358495283.

Subproblem 1

x + -0.75 = 2.358495283 Simplifying x + -0.75 = 2.358495283 Reorder the terms: -0.75 + x = 2.358495283 Solving -0.75 + x = 2.358495283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 2.358495283 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 2.358495283 + 0.75 x = 2.358495283 + 0.75 Combine like terms: 2.358495283 + 0.75 = 3.108495283 x = 3.108495283 Simplifying x = 3.108495283

Subproblem 2

x + -0.75 = -2.358495283 Simplifying x + -0.75 = -2.358495283 Reorder the terms: -0.75 + x = -2.358495283 Solving -0.75 + x = -2.358495283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -2.358495283 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -2.358495283 + 0.75 x = -2.358495283 + 0.75 Combine like terms: -2.358495283 + 0.75 = -1.608495283 x = -1.608495283 Simplifying x = -1.608495283

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.108495283, -1.608495283}

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