(4x-3)(2x+5)=5000

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Solution for (4x-3)(2x+5)=5000 equation:


Simplifying
(4x + -3)(2x + 5) = 5000

Reorder the terms:
(-3 + 4x)(2x + 5) = 5000

Reorder the terms:
(-3 + 4x)(5 + 2x) = 5000

Multiply (-3 + 4x) * (5 + 2x)
(-3(5 + 2x) + 4x * (5 + 2x)) = 5000
((5 * -3 + 2x * -3) + 4x * (5 + 2x)) = 5000
((-15 + -6x) + 4x * (5 + 2x)) = 5000
(-15 + -6x + (5 * 4x + 2x * 4x)) = 5000
(-15 + -6x + (20x + 8x2)) = 5000

Combine like terms: -6x + 20x = 14x
(-15 + 14x + 8x2) = 5000

Solving
-15 + 14x + 8x2 = 5000

Solving for variable 'x'.

Reorder the terms:
-15 + -5000 + 14x + 8x2 = 5000 + -5000

Combine like terms: -15 + -5000 = -5015
-5015 + 14x + 8x2 = 5000 + -5000

Combine like terms: 5000 + -5000 = 0
-5015 + 14x + 8x2 = 0

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

Divide each side by '8'.
-626.875 + 1.75x + x2 = 0

Move the constant term to the right:

Add '626.875' to each side of the equation.
-626.875 + 1.75x + 626.875 + x2 = 0 + 626.875

Reorder the terms:
-626.875 + 626.875 + 1.75x + x2 = 0 + 626.875

Combine like terms: -626.875 + 626.875 = 0.000
0.000 + 1.75x + x2 = 0 + 626.875
1.75x + x2 = 0 + 626.875

Combine like terms: 0 + 626.875 = 626.875
1.75x + x2 = 626.875

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = 626.875 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 626.875 + 0.765625

Combine like terms: 626.875 + 0.765625 = 627.640625
0.765625 + 1.75x + x2 = 627.640625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 627.640625

Calculate the square root of the right side: 25.052756834

Break this problem into two subproblems by setting 
(x + 0.875) equal to 25.052756834 and -25.052756834.

Subproblem 1

x + 0.875 = 25.052756834 Simplifying x + 0.875 = 25.052756834 Reorder the terms: 0.875 + x = 25.052756834 Solving 0.875 + x = 25.052756834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 25.052756834 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 25.052756834 + -0.875 x = 25.052756834 + -0.875 Combine like terms: 25.052756834 + -0.875 = 24.177756834 x = 24.177756834 Simplifying x = 24.177756834

Subproblem 2

x + 0.875 = -25.052756834 Simplifying x + 0.875 = -25.052756834 Reorder the terms: 0.875 + x = -25.052756834 Solving 0.875 + x = -25.052756834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -25.052756834 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -25.052756834 + -0.875 x = -25.052756834 + -0.875 Combine like terms: -25.052756834 + -0.875 = -25.927756834 x = -25.927756834 Simplifying x = -25.927756834

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.177756834, -25.927756834}

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