15x^2-30x+13=0

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Solution for 15x^2-30x+13=0 equation:


Simplifying
15x2 + -30x + 13 = 0

Reorder the terms:
13 + -30x + 15x2 = 0

Solving
13 + -30x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
0.8666666667 + -2x + x2 = 0

Move the constant term to the right:

Add '-0.8666666667' to each side of the equation.
0.8666666667 + -2x + -0.8666666667 + x2 = 0 + -0.8666666667

Reorder the terms:
0.8666666667 + -0.8666666667 + -2x + x2 = 0 + -0.8666666667

Combine like terms: 0.8666666667 + -0.8666666667 = 0.0000000000
0.0000000000 + -2x + x2 = 0 + -0.8666666667
-2x + x2 = 0 + -0.8666666667

Combine like terms: 0 + -0.8666666667 = -0.8666666667
-2x + x2 = -0.8666666667

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = -0.8666666667 + 1

Reorder the terms:
1 + -2x + x2 = -0.8666666667 + 1

Combine like terms: -0.8666666667 + 1 = 0.1333333333
1 + -2x + x2 = 0.1333333333

Factor a perfect square on the left side:
(x + -1)(x + -1) = 0.1333333333

Calculate the square root of the right side: 0.365148372

Break this problem into two subproblems by setting 
(x + -1) equal to 0.365148372 and -0.365148372.

Subproblem 1

x + -1 = 0.365148372 Simplifying x + -1 = 0.365148372 Reorder the terms: -1 + x = 0.365148372 Solving -1 + x = 0.365148372 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 0.365148372 + 1 Combine like terms: -1 + 1 = 0 0 + x = 0.365148372 + 1 x = 0.365148372 + 1 Combine like terms: 0.365148372 + 1 = 1.365148372 x = 1.365148372 Simplifying x = 1.365148372

Subproblem 2

x + -1 = -0.365148372 Simplifying x + -1 = -0.365148372 Reorder the terms: -1 + x = -0.365148372 Solving -1 + x = -0.365148372 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -0.365148372 + 1 Combine like terms: -1 + 1 = 0 0 + x = -0.365148372 + 1 x = -0.365148372 + 1 Combine like terms: -0.365148372 + 1 = 0.634851628 x = 0.634851628 Simplifying x = 0.634851628

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.365148372, 0.634851628}

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