x^2+15x=2000

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Solution for x^2+15x=2000 equation:


Simplifying
x2 + 15x = 2000

Reorder the terms:
15x + x2 = 2000

Solving
15x + x2 = 2000

Solving for variable 'x'.

Reorder the terms:
-2000 + 15x + x2 = 2000 + -2000

Combine like terms: 2000 + -2000 = 0
-2000 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '2000' to each side of the equation.
-2000 + 15x + 2000 + x2 = 0 + 2000

Reorder the terms:
-2000 + 2000 + 15x + x2 = 0 + 2000

Combine like terms: -2000 + 2000 = 0
0 + 15x + x2 = 0 + 2000
15x + x2 = 0 + 2000

Combine like terms: 0 + 2000 = 2000
15x + x2 = 2000

The x term is 15x.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15x + 56.25 + x2 = 2000 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 2000 + 56.25

Combine like terms: 2000 + 56.25 = 2056.25
56.25 + 15x + x2 = 2056.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 2056.25

Calculate the square root of the right side: 45.345892868

Break this problem into two subproblems by setting 
(x + 7.5) equal to 45.345892868 and -45.345892868.

Subproblem 1

x + 7.5 = 45.345892868 Simplifying x + 7.5 = 45.345892868 Reorder the terms: 7.5 + x = 45.345892868 Solving 7.5 + x = 45.345892868 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 45.345892868 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 45.345892868 + -7.5 x = 45.345892868 + -7.5 Combine like terms: 45.345892868 + -7.5 = 37.845892868 x = 37.845892868 Simplifying x = 37.845892868

Subproblem 2

x + 7.5 = -45.345892868 Simplifying x + 7.5 = -45.345892868 Reorder the terms: 7.5 + x = -45.345892868 Solving 7.5 + x = -45.345892868 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -45.345892868 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -45.345892868 + -7.5 x = -45.345892868 + -7.5 Combine like terms: -45.345892868 + -7.5 = -52.845892868 x = -52.845892868 Simplifying x = -52.845892868

Solution

The solution to the problem is based on the solutions from the subproblems. x = {37.845892868, -52.845892868}

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