0=15x-0.1x^2-260

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Solution for 0=15x-0.1x^2-260 equation:


Simplifying
0 = 15x + -0.1x2 + -260

Reorder the terms:
0 = -260 + 15x + -0.1x2

Solving
0 = -260 + 15x + -0.1x2

Solving for variable 'x'.

Combine like terms: 0 + 260 = 260
260 + -15x + 0.1x2 = -260 + 15x + -0.1x2 + 260 + -15x + 0.1x2

Reorder the terms:
260 + -15x + 0.1x2 = -260 + 260 + 15x + -15x + -0.1x2 + 0.1x2

Combine like terms: -260 + 260 = 0
260 + -15x + 0.1x2 = 0 + 15x + -15x + -0.1x2 + 0.1x2
260 + -15x + 0.1x2 = 15x + -15x + -0.1x2 + 0.1x2

Combine like terms: 15x + -15x = 0
260 + -15x + 0.1x2 = 0 + -0.1x2 + 0.1x2
260 + -15x + 0.1x2 = -0.1x2 + 0.1x2

Combine like terms: -0.1x2 + 0.1x2 = 0.0
260 + -15x + 0.1x2 = 0.0

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

Divide each side by '0.1'.
2600 + -150x + x2 = 0

Move the constant term to the right:

Add '-2600' to each side of the equation.
2600 + -150x + -2600 + x2 = 0 + -2600

Reorder the terms:
2600 + -2600 + -150x + x2 = 0 + -2600

Combine like terms: 2600 + -2600 = 0
0 + -150x + x2 = 0 + -2600
-150x + x2 = 0 + -2600

Combine like terms: 0 + -2600 = -2600
-150x + x2 = -2600

The x term is -150x.  Take half its coefficient (-75).
Square it (5625) and add it to both sides.

Add '5625' to each side of the equation.
-150x + 5625 + x2 = -2600 + 5625

Reorder the terms:
5625 + -150x + x2 = -2600 + 5625

Combine like terms: -2600 + 5625 = 3025
5625 + -150x + x2 = 3025

Factor a perfect square on the left side:
(x + -75)(x + -75) = 3025

Calculate the square root of the right side: 55

Break this problem into two subproblems by setting 
(x + -75) equal to 55 and -55.

Subproblem 1

x + -75 = 55 Simplifying x + -75 = 55 Reorder the terms: -75 + x = 55 Solving -75 + x = 55 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '75' to each side of the equation. -75 + 75 + x = 55 + 75 Combine like terms: -75 + 75 = 0 0 + x = 55 + 75 x = 55 + 75 Combine like terms: 55 + 75 = 130 x = 130 Simplifying x = 130

Subproblem 2

x + -75 = -55 Simplifying x + -75 = -55 Reorder the terms: -75 + x = -55 Solving -75 + x = -55 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '75' to each side of the equation. -75 + 75 + x = -55 + 75 Combine like terms: -75 + 75 = 0 0 + x = -55 + 75 x = -55 + 75 Combine like terms: -55 + 75 = 20 x = 20 Simplifying x = 20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {130, 20}

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