(x+4)(2x-1)=24

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Solution for (x+4)(2x-1)=24 equation:


Simplifying
(x + 4)(2x + -1) = 24

Reorder the terms:
(4 + x)(2x + -1) = 24

Reorder the terms:
(4 + x)(-1 + 2x) = 24

Multiply (4 + x) * (-1 + 2x)
(4(-1 + 2x) + x(-1 + 2x)) = 24
((-1 * 4 + 2x * 4) + x(-1 + 2x)) = 24
((-4 + 8x) + x(-1 + 2x)) = 24
(-4 + 8x + (-1 * x + 2x * x)) = 24
(-4 + 8x + (-1x + 2x2)) = 24

Combine like terms: 8x + -1x = 7x
(-4 + 7x + 2x2) = 24

Solving
-4 + 7x + 2x2 = 24

Solving for variable 'x'.

Reorder the terms:
-4 + -24 + 7x + 2x2 = 24 + -24

Combine like terms: -4 + -24 = -28
-28 + 7x + 2x2 = 24 + -24

Combine like terms: 24 + -24 = 0
-28 + 7x + 2x2 = 0

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

Divide each side by '2'.
-14 + 3.5x + x2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 3.5x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + 3.5x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 3.5x + x2 = 0 + 14
3.5x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
3.5x + x2 = 14

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 14 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 14 + 3.0625

Combine like terms: 14 + 3.0625 = 17.0625
3.0625 + 3.5x + x2 = 17.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 17.0625

Calculate the square root of the right side: 4.13067791

Break this problem into two subproblems by setting 
(x + 1.75) equal to 4.13067791 and -4.13067791.

Subproblem 1

x + 1.75 = 4.13067791 Simplifying x + 1.75 = 4.13067791 Reorder the terms: 1.75 + x = 4.13067791 Solving 1.75 + x = 4.13067791 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 4.13067791 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 4.13067791 + -1.75 x = 4.13067791 + -1.75 Combine like terms: 4.13067791 + -1.75 = 2.38067791 x = 2.38067791 Simplifying x = 2.38067791

Subproblem 2

x + 1.75 = -4.13067791 Simplifying x + 1.75 = -4.13067791 Reorder the terms: 1.75 + x = -4.13067791 Solving 1.75 + x = -4.13067791 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -4.13067791 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -4.13067791 + -1.75 x = -4.13067791 + -1.75 Combine like terms: -4.13067791 + -1.75 = -5.88067791 x = -5.88067791 Simplifying x = -5.88067791

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.38067791, -5.88067791}

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