24x+15=2x(3+4x)

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Solution for 24x+15=2x(3+4x) equation:


Simplifying
24x + 15 = 2x(3 + 4x)

Reorder the terms:
15 + 24x = 2x(3 + 4x)
15 + 24x = (3 * 2x + 4x * 2x)
15 + 24x = (6x + 8x2)

Solving
15 + 24x = 6x + 8x2

Solving for variable 'x'.

Combine like terms: 24x + -6x = 18x
15 + 18x + -8x2 = 6x + 8x2 + -6x + -8x2

Reorder the terms:
15 + 18x + -8x2 = 6x + -6x + 8x2 + -8x2

Combine like terms: 6x + -6x = 0
15 + 18x + -8x2 = 0 + 8x2 + -8x2
15 + 18x + -8x2 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
15 + 18x + -8x2 = 0

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

Divide each side by '-8'.
-1.875 + -2.25x + x2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + -2.25x + 1.875 + x2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + -2.25x + x2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + -2.25x + x2 = 0 + 1.875
-2.25x + x2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
-2.25x + x2 = 1.875

The x term is -2.25x.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25x + 1.265625 + x2 = 1.875 + 1.265625

Reorder the terms:
1.265625 + -2.25x + x2 = 1.875 + 1.265625

Combine like terms: 1.875 + 1.265625 = 3.140625
1.265625 + -2.25x + x2 = 3.140625

Factor a perfect square on the left side:
(x + -1.125)(x + -1.125) = 3.140625

Calculate the square root of the right side: 1.77218086

Break this problem into two subproblems by setting 
(x + -1.125) equal to 1.77218086 and -1.77218086.

Subproblem 1

x + -1.125 = 1.77218086 Simplifying x + -1.125 = 1.77218086 Reorder the terms: -1.125 + x = 1.77218086 Solving -1.125 + x = 1.77218086 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = 1.77218086 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = 1.77218086 + 1.125 x = 1.77218086 + 1.125 Combine like terms: 1.77218086 + 1.125 = 2.89718086 x = 2.89718086 Simplifying x = 2.89718086

Subproblem 2

x + -1.125 = -1.77218086 Simplifying x + -1.125 = -1.77218086 Reorder the terms: -1.125 + x = -1.77218086 Solving -1.125 + x = -1.77218086 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = -1.77218086 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = -1.77218086 + 1.125 x = -1.77218086 + 1.125 Combine like terms: -1.77218086 + 1.125 = -0.64718086 x = -0.64718086 Simplifying x = -0.64718086

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.89718086, -0.64718086}

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