(x+15)(x+30)=8000

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Solution for (x+15)(x+30)=8000 equation:


Simplifying
(x + 15)(x + 30) = 8000

Reorder the terms:
(15 + x)(x + 30) = 8000

Reorder the terms:
(15 + x)(30 + x) = 8000

Multiply (15 + x) * (30 + x)
(15(30 + x) + x(30 + x)) = 8000
((30 * 15 + x * 15) + x(30 + x)) = 8000
((450 + 15x) + x(30 + x)) = 8000
(450 + 15x + (30 * x + x * x)) = 8000
(450 + 15x + (30x + x2)) = 8000

Combine like terms: 15x + 30x = 45x
(450 + 45x + x2) = 8000

Solving
450 + 45x + x2 = 8000

Solving for variable 'x'.

Reorder the terms:
450 + -8000 + 45x + x2 = 8000 + -8000

Combine like terms: 450 + -8000 = -7550
-7550 + 45x + x2 = 8000 + -8000

Combine like terms: 8000 + -8000 = 0
-7550 + 45x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7550' to each side of the equation.
-7550 + 45x + 7550 + x2 = 0 + 7550

Reorder the terms:
-7550 + 7550 + 45x + x2 = 0 + 7550

Combine like terms: -7550 + 7550 = 0
0 + 45x + x2 = 0 + 7550
45x + x2 = 0 + 7550

Combine like terms: 0 + 7550 = 7550
45x + x2 = 7550

The x term is 45x.  Take half its coefficient (22.5).
Square it (506.25) and add it to both sides.

Add '506.25' to each side of the equation.
45x + 506.25 + x2 = 7550 + 506.25

Reorder the terms:
506.25 + 45x + x2 = 7550 + 506.25

Combine like terms: 7550 + 506.25 = 8056.25
506.25 + 45x + x2 = 8056.25

Factor a perfect square on the left side:
(x + 22.5)(x + 22.5) = 8056.25

Calculate the square root of the right side: 89.756615355

Break this problem into two subproblems by setting 
(x + 22.5) equal to 89.756615355 and -89.756615355.

Subproblem 1

x + 22.5 = 89.756615355 Simplifying x + 22.5 = 89.756615355 Reorder the terms: 22.5 + x = 89.756615355 Solving 22.5 + x = 89.756615355 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22.5' to each side of the equation. 22.5 + -22.5 + x = 89.756615355 + -22.5 Combine like terms: 22.5 + -22.5 = 0.0 0.0 + x = 89.756615355 + -22.5 x = 89.756615355 + -22.5 Combine like terms: 89.756615355 + -22.5 = 67.256615355 x = 67.256615355 Simplifying x = 67.256615355

Subproblem 2

x + 22.5 = -89.756615355 Simplifying x + 22.5 = -89.756615355 Reorder the terms: 22.5 + x = -89.756615355 Solving 22.5 + x = -89.756615355 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22.5' to each side of the equation. 22.5 + -22.5 + x = -89.756615355 + -22.5 Combine like terms: 22.5 + -22.5 = 0.0 0.0 + x = -89.756615355 + -22.5 x = -89.756615355 + -22.5 Combine like terms: -89.756615355 + -22.5 = -112.256615355 x = -112.256615355 Simplifying x = -112.256615355

Solution

The solution to the problem is based on the solutions from the subproblems. x = {67.256615355, -112.256615355}

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