4x(2x+3)=11

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Solution for 4x(2x+3)=11 equation:


Simplifying
4x(2x + 3) = 11

Reorder the terms:
4x(3 + 2x) = 11
(3 * 4x + 2x * 4x) = 11
(12x + 8x2) = 11

Solving
12x + 8x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + 12x + 8x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 12x + 8x2 = 0

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

Divide each side by '8'.
-1.375 + 1.5x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + 1.5x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + 1.5x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + 1.5x + x2 = 0 + 1.375
1.5x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
1.5x + x2 = 1.375

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 1.375 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 1.375 + 0.5625

Combine like terms: 1.375 + 0.5625 = 1.9375
0.5625 + 1.5x + x2 = 1.9375

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 1.9375

Calculate the square root of the right side: 1.391941091

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.391941091 and -1.391941091.

Subproblem 1

x + 0.75 = 1.391941091 Simplifying x + 0.75 = 1.391941091 Reorder the terms: 0.75 + x = 1.391941091 Solving 0.75 + x = 1.391941091 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 1.391941091 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 1.391941091 + -0.75 x = 1.391941091 + -0.75 Combine like terms: 1.391941091 + -0.75 = 0.641941091 x = 0.641941091 Simplifying x = 0.641941091

Subproblem 2

x + 0.75 = -1.391941091 Simplifying x + 0.75 = -1.391941091 Reorder the terms: 0.75 + x = -1.391941091 Solving 0.75 + x = -1.391941091 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -1.391941091 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -1.391941091 + -0.75 x = -1.391941091 + -0.75 Combine like terms: -1.391941091 + -0.75 = -2.141941091 x = -2.141941091 Simplifying x = -2.141941091

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.641941091, -2.141941091}

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