(x+2)(2x-5)=54

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Solution for (x+2)(2x-5)=54 equation:


Simplifying
(x + 2)(2x + -5) = 54

Reorder the terms:
(2 + x)(2x + -5) = 54

Reorder the terms:
(2 + x)(-5 + 2x) = 54

Multiply (2 + x) * (-5 + 2x)
(2(-5 + 2x) + x(-5 + 2x)) = 54
((-5 * 2 + 2x * 2) + x(-5 + 2x)) = 54
((-10 + 4x) + x(-5 + 2x)) = 54
(-10 + 4x + (-5 * x + 2x * x)) = 54
(-10 + 4x + (-5x + 2x2)) = 54

Combine like terms: 4x + -5x = -1x
(-10 + -1x + 2x2) = 54

Solving
-10 + -1x + 2x2 = 54

Solving for variable 'x'.

Reorder the terms:
-10 + -54 + -1x + 2x2 = 54 + -54

Combine like terms: -10 + -54 = -64
-64 + -1x + 2x2 = 54 + -54

Combine like terms: 54 + -54 = 0
-64 + -1x + 2x2 = 0

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

Divide each side by '2'.
-32 + -0.5x + x2 = 0

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + -0.5x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + -0.5x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + -0.5x + x2 = 0 + 32
-0.5x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
-0.5x + x2 = 32

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 = 32 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 32 + 0.0625

Combine like terms: 32 + 0.0625 = 32.0625
0.0625 + -0.5x + x2 = 32.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 32.0625

Calculate the square root of the right side: 5.662375826

Break this problem into two subproblems by setting 
(x + -0.25) equal to 5.662375826 and -5.662375826.

Subproblem 1

x + -0.25 = 5.662375826 Simplifying x + -0.25 = 5.662375826 Reorder the terms: -0.25 + x = 5.662375826 Solving -0.25 + x = 5.662375826 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 = 5.662375826 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 5.662375826 + 0.25 x = 5.662375826 + 0.25 Combine like terms: 5.662375826 + 0.25 = 5.912375826 x = 5.912375826 Simplifying x = 5.912375826

Subproblem 2

x + -0.25 = -5.662375826 Simplifying x + -0.25 = -5.662375826 Reorder the terms: -0.25 + x = -5.662375826 Solving -0.25 + x = -5.662375826 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 = -5.662375826 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -5.662375826 + 0.25 x = -5.662375826 + 0.25 Combine like terms: -5.662375826 + 0.25 = -5.412375826 x = -5.412375826 Simplifying x = -5.412375826

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.912375826, -5.412375826}

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