4(3x+5)x=11

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Solution for 4(3x+5)x=11 equation:


Simplifying
4(3x + 5) * x = 11

Reorder the terms:
4(5 + 3x) * x = 11

Reorder the terms for easier multiplication:
4x(5 + 3x) = 11
(5 * 4x + 3x * 4x) = 11
(20x + 12x2) = 11

Solving
20x + 12x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + 20x + 12x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 20x + 12x2 = 0

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

Divide each side by '12'.
-0.9166666667 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '0.9166666667' to each side of the equation.
-0.9166666667 + 1.666666667x + 0.9166666667 + x2 = 0 + 0.9166666667

Reorder the terms:
-0.9166666667 + 0.9166666667 + 1.666666667x + x2 = 0 + 0.9166666667

Combine like terms: -0.9166666667 + 0.9166666667 = 0.0000000000
0.0000000000 + 1.666666667x + x2 = 0 + 0.9166666667
1.666666667x + x2 = 0 + 0.9166666667

Combine like terms: 0 + 0.9166666667 = 0.9166666667
1.666666667x + x2 = 0.9166666667

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 0.9166666667 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 0.9166666667 + 0.6944444447

Combine like terms: 0.9166666667 + 0.6944444447 = 1.6111111114
0.6944444447 + 1.666666667x + x2 = 1.6111111114

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 1.6111111114

Calculate the square root of the right side: 1.269295518

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 1.269295518 and -1.269295518.

Subproblem 1

x + 0.8333333335 = 1.269295518 Simplifying x + 0.8333333335 = 1.269295518 Reorder the terms: 0.8333333335 + x = 1.269295518 Solving 0.8333333335 + x = 1.269295518 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = 1.269295518 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = 1.269295518 + -0.8333333335 x = 1.269295518 + -0.8333333335 Combine like terms: 1.269295518 + -0.8333333335 = 0.4359621845 x = 0.4359621845 Simplifying x = 0.4359621845

Subproblem 2

x + 0.8333333335 = -1.269295518 Simplifying x + 0.8333333335 = -1.269295518 Reorder the terms: 0.8333333335 + x = -1.269295518 Solving 0.8333333335 + x = -1.269295518 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = -1.269295518 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = -1.269295518 + -0.8333333335 x = -1.269295518 + -0.8333333335 Combine like terms: -1.269295518 + -0.8333333335 = -2.1026288515 x = -2.1026288515 Simplifying x = -2.1026288515

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4359621845, -2.1026288515}

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