(2x+3)(x-6)=90

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Solution for (2x+3)(x-6)=90 equation:


Simplifying
(2x + 3)(x + -6) = 90

Reorder the terms:
(3 + 2x)(x + -6) = 90

Reorder the terms:
(3 + 2x)(-6 + x) = 90

Multiply (3 + 2x) * (-6 + x)
(3(-6 + x) + 2x * (-6 + x)) = 90
((-6 * 3 + x * 3) + 2x * (-6 + x)) = 90
((-18 + 3x) + 2x * (-6 + x)) = 90
(-18 + 3x + (-6 * 2x + x * 2x)) = 90
(-18 + 3x + (-12x + 2x2)) = 90

Combine like terms: 3x + -12x = -9x
(-18 + -9x + 2x2) = 90

Solving
-18 + -9x + 2x2 = 90

Solving for variable 'x'.

Reorder the terms:
-18 + -90 + -9x + 2x2 = 90 + -90

Combine like terms: -18 + -90 = -108
-108 + -9x + 2x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-108 + -9x + 2x2 = 0

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

Divide each side by '2'.
-54 + -4.5x + x2 = 0

Move the constant term to the right:

Add '54' to each side of the equation.
-54 + -4.5x + 54 + x2 = 0 + 54

Reorder the terms:
-54 + 54 + -4.5x + x2 = 0 + 54

Combine like terms: -54 + 54 = 0
0 + -4.5x + x2 = 0 + 54
-4.5x + x2 = 0 + 54

Combine like terms: 0 + 54 = 54
-4.5x + x2 = 54

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 54 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 54 + 5.0625

Combine like terms: 54 + 5.0625 = 59.0625
5.0625 + -4.5x + x2 = 59.0625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 59.0625

Calculate the square root of the right side: 7.685213074

Break this problem into two subproblems by setting 
(x + -2.25) equal to 7.685213074 and -7.685213074.

Subproblem 1

x + -2.25 = 7.685213074 Simplifying x + -2.25 = 7.685213074 Reorder the terms: -2.25 + x = 7.685213074 Solving -2.25 + x = 7.685213074 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 7.685213074 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 7.685213074 + 2.25 x = 7.685213074 + 2.25 Combine like terms: 7.685213074 + 2.25 = 9.935213074 x = 9.935213074 Simplifying x = 9.935213074

Subproblem 2

x + -2.25 = -7.685213074 Simplifying x + -2.25 = -7.685213074 Reorder the terms: -2.25 + x = -7.685213074 Solving -2.25 + x = -7.685213074 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -7.685213074 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -7.685213074 + 2.25 x = -7.685213074 + 2.25 Combine like terms: -7.685213074 + 2.25 = -5.435213074 x = -5.435213074 Simplifying x = -5.435213074

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.935213074, -5.435213074}

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