0.1x^2-13x+360=0

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Solution for 0.1x^2-13x+360=0 equation:


Simplifying
0.1x2 + -13x + 360 = 0

Reorder the terms:
360 + -13x + 0.1x2 = 0

Solving
360 + -13x + 0.1x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.1'.
3600 + -130x + x2 = 0

Move the constant term to the right:

Add '-3600' to each side of the equation.
3600 + -130x + -3600 + x2 = 0 + -3600

Reorder the terms:
3600 + -3600 + -130x + x2 = 0 + -3600

Combine like terms: 3600 + -3600 = 0
0 + -130x + x2 = 0 + -3600
-130x + x2 = 0 + -3600

Combine like terms: 0 + -3600 = -3600
-130x + x2 = -3600

The x term is -130x.  Take half its coefficient (-65).
Square it (4225) and add it to both sides.

Add '4225' to each side of the equation.
-130x + 4225 + x2 = -3600 + 4225

Reorder the terms:
4225 + -130x + x2 = -3600 + 4225

Combine like terms: -3600 + 4225 = 625
4225 + -130x + x2 = 625

Factor a perfect square on the left side:
(x + -65)(x + -65) = 625

Calculate the square root of the right side: 25

Break this problem into two subproblems by setting 
(x + -65) equal to 25 and -25.

Subproblem 1

x + -65 = 25 Simplifying x + -65 = 25 Reorder the terms: -65 + x = 25 Solving -65 + x = 25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '65' to each side of the equation. -65 + 65 + x = 25 + 65 Combine like terms: -65 + 65 = 0 0 + x = 25 + 65 x = 25 + 65 Combine like terms: 25 + 65 = 90 x = 90 Simplifying x = 90

Subproblem 2

x + -65 = -25 Simplifying x + -65 = -25 Reorder the terms: -65 + x = -25 Solving -65 + x = -25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '65' to each side of the equation. -65 + 65 + x = -25 + 65 Combine like terms: -65 + 65 = 0 0 + x = -25 + 65 x = -25 + 65 Combine like terms: -25 + 65 = 40 x = 40 Simplifying x = 40

Solution

The solution to the problem is based on the solutions from the subproblems. x = {90, 40}

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