12(4x-3)=x(2x+1)

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Solution for 12(4x-3)=x(2x+1) equation:


Simplifying
12(4x + -3) = x(2x + 1)

Reorder the terms:
12(-3 + 4x) = x(2x + 1)
(-3 * 12 + 4x * 12) = x(2x + 1)
(-36 + 48x) = x(2x + 1)

Reorder the terms:
-36 + 48x = x(1 + 2x)
-36 + 48x = (1 * x + 2x * x)
-36 + 48x = (1x + 2x2)

Solving
-36 + 48x = 1x + 2x2

Solving for variable 'x'.

Combine like terms: 48x + -1x = 47x
-36 + 47x + -2x2 = 1x + 2x2 + -1x + -2x2

Reorder the terms:
-36 + 47x + -2x2 = 1x + -1x + 2x2 + -2x2

Combine like terms: 1x + -1x = 0
-36 + 47x + -2x2 = 0 + 2x2 + -2x2
-36 + 47x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-36 + 47x + -2x2 = 0

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

Divide each side by '-2'.
18 + -23.5x + x2 = 0

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -23.5x + -18 + x2 = 0 + -18

Reorder the terms:
18 + -18 + -23.5x + x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -23.5x + x2 = 0 + -18
-23.5x + x2 = 0 + -18

Combine like terms: 0 + -18 = -18
-23.5x + x2 = -18

The x term is -23.5x.  Take half its coefficient (-11.75).
Square it (138.0625) and add it to both sides.

Add '138.0625' to each side of the equation.
-23.5x + 138.0625 + x2 = -18 + 138.0625

Reorder the terms:
138.0625 + -23.5x + x2 = -18 + 138.0625

Combine like terms: -18 + 138.0625 = 120.0625
138.0625 + -23.5x + x2 = 120.0625

Factor a perfect square on the left side:
(x + -11.75)(x + -11.75) = 120.0625

Calculate the square root of the right side: 10.9573035

Break this problem into two subproblems by setting 
(x + -11.75) equal to 10.9573035 and -10.9573035.

Subproblem 1

x + -11.75 = 10.9573035 Simplifying x + -11.75 = 10.9573035 Reorder the terms: -11.75 + x = 10.9573035 Solving -11.75 + x = 10.9573035 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.75' to each side of the equation. -11.75 + 11.75 + x = 10.9573035 + 11.75 Combine like terms: -11.75 + 11.75 = 0.00 0.00 + x = 10.9573035 + 11.75 x = 10.9573035 + 11.75 Combine like terms: 10.9573035 + 11.75 = 22.7073035 x = 22.7073035 Simplifying x = 22.7073035

Subproblem 2

x + -11.75 = -10.9573035 Simplifying x + -11.75 = -10.9573035 Reorder the terms: -11.75 + x = -10.9573035 Solving -11.75 + x = -10.9573035 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.75' to each side of the equation. -11.75 + 11.75 + x = -10.9573035 + 11.75 Combine like terms: -11.75 + 11.75 = 0.00 0.00 + x = -10.9573035 + 11.75 x = -10.9573035 + 11.75 Combine like terms: -10.9573035 + 11.75 = 0.7926965 x = 0.7926965 Simplifying x = 0.7926965

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.7073035, 0.7926965}

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