91=(2x-3)(x+1)

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Solution for 91=(2x-3)(x+1) equation:


Simplifying
91 = (2x + -3)(x + 1)

Reorder the terms:
91 = (-3 + 2x)(x + 1)

Reorder the terms:
91 = (-3 + 2x)(1 + x)

Multiply (-3 + 2x) * (1 + x)
91 = (-3(1 + x) + 2x * (1 + x))
91 = ((1 * -3 + x * -3) + 2x * (1 + x))
91 = ((-3 + -3x) + 2x * (1 + x))
91 = (-3 + -3x + (1 * 2x + x * 2x))
91 = (-3 + -3x + (2x + 2x2))

Combine like terms: -3x + 2x = -1x
91 = (-3 + -1x + 2x2)

Solving
91 = -3 + -1x + 2x2

Solving for variable 'x'.

Combine like terms: 91 + 3 = 94
94 + x + -2x2 = -3 + -1x + 2x2 + 3 + x + -2x2

Reorder the terms:
94 + x + -2x2 = -3 + 3 + -1x + x + 2x2 + -2x2

Combine like terms: -3 + 3 = 0
94 + x + -2x2 = 0 + -1x + x + 2x2 + -2x2
94 + x + -2x2 = -1x + x + 2x2 + -2x2

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

Combine like terms: 2x2 + -2x2 = 0
94 + x + -2x2 = 0

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

Divide each side by '-2'.
-47 + -0.5x + x2 = 0

Move the constant term to the right:

Add '47' to each side of the equation.
-47 + -0.5x + 47 + x2 = 0 + 47

Reorder the terms:
-47 + 47 + -0.5x + x2 = 0 + 47

Combine like terms: -47 + 47 = 0
0 + -0.5x + x2 = 0 + 47
-0.5x + x2 = 0 + 47

Combine like terms: 0 + 47 = 47
-0.5x + x2 = 47

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

Add '0.25' to each side of the equation.
-0.5x + 0.25 + x2 = 47 + 0.25

Reorder the terms:
0.25 + -0.5x + x2 = 47 + 0.25

Combine like terms: 47 + 0.25 = 47.25
0.25 + -0.5x + x2 = 47.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 47.25

Calculate the square root of the right side: 6.873863542

Break this problem into two subproblems by setting 
(x + 0.5) equal to 6.873863542 and -6.873863542.

Subproblem 1

x + 0.5 = 6.873863542 Simplifying x + 0.5 = 6.873863542 Reorder the terms: 0.5 + x = 6.873863542 Solving 0.5 + x = 6.873863542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 6.873863542 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 6.873863542 + -0.5 x = 6.873863542 + -0.5 Combine like terms: 6.873863542 + -0.5 = 6.373863542 x = 6.373863542 Simplifying x = 6.373863542

Subproblem 2

x + 0.5 = -6.873863542 Simplifying x + 0.5 = -6.873863542 Reorder the terms: 0.5 + x = -6.873863542 Solving 0.5 + x = -6.873863542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -6.873863542 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -6.873863542 + -0.5 x = -6.873863542 + -0.5 Combine like terms: -6.873863542 + -0.5 = -7.373863542 x = -7.373863542 Simplifying x = -7.373863542

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.373863542, -7.373863542}

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