.5(4x+1)(3x)=54

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Solution for .5(4x+1)(3x)=54 equation:


Simplifying
0.5(4x + 1)(3x) = 54

Reorder the terms:
0.5(1 + 4x)(3x) = 54

Remove parenthesis around (3x)
0.5(1 + 4x) * 3x = 54

Reorder the terms for easier multiplication:
0.5 * 3x(1 + 4x) = 54

Multiply 0.5 * 3
1.5x(1 + 4x) = 54
(1 * 1.5x + 4x * 1.5x) = 54
(1.5x + 6x2) = 54

Solving
1.5x + 6x2 = 54

Solving for variable 'x'.

Reorder the terms:
-54 + 1.5x + 6x2 = 54 + -54

Combine like terms: 54 + -54 = 0
-54 + 1.5x + 6x2 = 0

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

Divide each side by '6'.
-9 + 0.25x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 0.25x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 0.25x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 0.25x + x2 = 0 + 9
0.25x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
0.25x + x2 = 9

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 9 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 9 + 0.015625

Combine like terms: 9 + 0.015625 = 9.015625
0.015625 + 0.25x + x2 = 9.015625

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 9.015625

Calculate the square root of the right side: 3.002603037

Break this problem into two subproblems by setting 
(x + 0.125) equal to 3.002603037 and -3.002603037.

Subproblem 1

x + 0.125 = 3.002603037 Simplifying x + 0.125 = 3.002603037 Reorder the terms: 0.125 + x = 3.002603037 Solving 0.125 + x = 3.002603037 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 3.002603037 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 3.002603037 + -0.125 x = 3.002603037 + -0.125 Combine like terms: 3.002603037 + -0.125 = 2.877603037 x = 2.877603037 Simplifying x = 2.877603037

Subproblem 2

x + 0.125 = -3.002603037 Simplifying x + 0.125 = -3.002603037 Reorder the terms: 0.125 + x = -3.002603037 Solving 0.125 + x = -3.002603037 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -3.002603037 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -3.002603037 + -0.125 x = -3.002603037 + -0.125 Combine like terms: -3.002603037 + -0.125 = -3.127603037 x = -3.127603037 Simplifying x = -3.127603037

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.877603037, -3.127603037}

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