(2x-7)(x+4)=33856

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Solution for (2x-7)(x+4)=33856 equation:


Simplifying
(2x + -7)(x + 4) = 33856

Reorder the terms:
(-7 + 2x)(x + 4) = 33856

Reorder the terms:
(-7 + 2x)(4 + x) = 33856

Multiply (-7 + 2x) * (4 + x)
(-7(4 + x) + 2x * (4 + x)) = 33856
((4 * -7 + x * -7) + 2x * (4 + x)) = 33856
((-28 + -7x) + 2x * (4 + x)) = 33856
(-28 + -7x + (4 * 2x + x * 2x)) = 33856
(-28 + -7x + (8x + 2x2)) = 33856

Combine like terms: -7x + 8x = 1x
(-28 + 1x + 2x2) = 33856

Solving
-28 + 1x + 2x2 = 33856

Solving for variable 'x'.

Reorder the terms:
-28 + -33856 + 1x + 2x2 = 33856 + -33856

Combine like terms: -28 + -33856 = -33884
-33884 + 1x + 2x2 = 33856 + -33856

Combine like terms: 33856 + -33856 = 0
-33884 + 1x + 2x2 = 0

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

Divide each side by '2'.
-16942 + 0.5x + x2 = 0

Move the constant term to the right:

Add '16942' to each side of the equation.
-16942 + 0.5x + 16942 + x2 = 0 + 16942

Reorder the terms:
-16942 + 16942 + 0.5x + x2 = 0 + 16942

Combine like terms: -16942 + 16942 = 0
0 + 0.5x + x2 = 0 + 16942
0.5x + x2 = 0 + 16942

Combine like terms: 0 + 16942 = 16942
0.5x + x2 = 16942

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 16942 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 16942 + 0.0625

Combine like terms: 16942 + 0.0625 = 16942.0625
0.0625 + 0.5x + x2 = 16942.0625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 16942.0625

Calculate the square root of the right side: 130.161678308

Break this problem into two subproblems by setting 
(x + 0.25) equal to 130.161678308 and -130.161678308.

Subproblem 1

x + 0.25 = 130.161678308 Simplifying x + 0.25 = 130.161678308 Reorder the terms: 0.25 + x = 130.161678308 Solving 0.25 + x = 130.161678308 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 130.161678308 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 130.161678308 + -0.25 x = 130.161678308 + -0.25 Combine like terms: 130.161678308 + -0.25 = 129.911678308 x = 129.911678308 Simplifying x = 129.911678308

Subproblem 2

x + 0.25 = -130.161678308 Simplifying x + 0.25 = -130.161678308 Reorder the terms: 0.25 + x = -130.161678308 Solving 0.25 + x = -130.161678308 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -130.161678308 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -130.161678308 + -0.25 x = -130.161678308 + -0.25 Combine like terms: -130.161678308 + -0.25 = -130.411678308 x = -130.411678308 Simplifying x = -130.411678308

Solution

The solution to the problem is based on the solutions from the subproblems. x = {129.911678308, -130.411678308}

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