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

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


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

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

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

Multiply (-3 + 2x) * (2 + x)
91 = (-3(2 + x) + 2x * (2 + x))
91 = ((2 * -3 + x * -3) + 2x * (2 + x))
91 = ((-6 + -3x) + 2x * (2 + x))
91 = (-6 + -3x + (2 * 2x + x * 2x))
91 = (-6 + -3x + (4x + 2x2))

Combine like terms: -3x + 4x = 1x
91 = (-6 + 1x + 2x2)

Solving
91 = -6 + 1x + 2x2

Solving for variable 'x'.

Combine like terms: 91 + 6 = 97
97 + -1x + -2x2 = -6 + 1x + 2x2 + 6 + -1x + -2x2

Reorder the terms:
97 + -1x + -2x2 = -6 + 6 + 1x + -1x + 2x2 + -2x2

Combine like terms: -6 + 6 = 0
97 + -1x + -2x2 = 0 + 1x + -1x + 2x2 + -2x2
97 + -1x + -2x2 = 1x + -1x + 2x2 + -2x2

Combine like terms: 1x + -1x = 0
97 + -1x + -2x2 = 0 + 2x2 + -2x2
97 + -1x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
97 + -1x + -2x2 = 0

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

Divide each side by '-2'.
-48.5 + 0.5x + x2 = 0

Move the constant term to the right:

Add '48.5' to each side of the equation.
-48.5 + 0.5x + 48.5 + x2 = 0 + 48.5

Reorder the terms:
-48.5 + 48.5 + 0.5x + x2 = 0 + 48.5

Combine like terms: -48.5 + 48.5 = 0.0
0.0 + 0.5x + x2 = 0 + 48.5
0.5x + x2 = 0 + 48.5

Combine like terms: 0 + 48.5 = 48.5
0.5x + x2 = 48.5

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 = 48.5 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 48.5 + 0.0625

Combine like terms: 48.5 + 0.0625 = 48.5625
0.0625 + 0.5x + x2 = 48.5625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 48.5625

Calculate the square root of the right side: 6.968679932

Break this problem into two subproblems by setting 
(x + 0.25) equal to 6.968679932 and -6.968679932.

Subproblem 1

x + 0.25 = 6.968679932 Simplifying x + 0.25 = 6.968679932 Reorder the terms: 0.25 + x = 6.968679932 Solving 0.25 + x = 6.968679932 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 = 6.968679932 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 6.968679932 + -0.25 x = 6.968679932 + -0.25 Combine like terms: 6.968679932 + -0.25 = 6.718679932 x = 6.718679932 Simplifying x = 6.718679932

Subproblem 2

x + 0.25 = -6.968679932 Simplifying x + 0.25 = -6.968679932 Reorder the terms: 0.25 + x = -6.968679932 Solving 0.25 + x = -6.968679932 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 = -6.968679932 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -6.968679932 + -0.25 x = -6.968679932 + -0.25 Combine like terms: -6.968679932 + -0.25 = -7.218679932 x = -7.218679932 Simplifying x = -7.218679932

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.718679932, -7.218679932}

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