36-56x+15x^2=0

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Solution for 36-56x+15x^2=0 equation:


Simplifying
36 + -56x + 15x2 = 0

Solving
36 + -56x + 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'.
2.4 + -3.733333333x + x2 = 0

Move the constant term to the right:

Add '-2.4' to each side of the equation.
2.4 + -3.733333333x + -2.4 + x2 = 0 + -2.4

Reorder the terms:
2.4 + -2.4 + -3.733333333x + x2 = 0 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + -3.733333333x + x2 = 0 + -2.4
-3.733333333x + x2 = 0 + -2.4

Combine like terms: 0 + -2.4 = -2.4
-3.733333333x + x2 = -2.4

The x term is -3.733333333x.  Take half its coefficient (-1.866666667).
Square it (3.484444446) and add it to both sides.

Add '3.484444446' to each side of the equation.
-3.733333333x + 3.484444446 + x2 = -2.4 + 3.484444446

Reorder the terms:
3.484444446 + -3.733333333x + x2 = -2.4 + 3.484444446

Combine like terms: -2.4 + 3.484444446 = 1.084444446
3.484444446 + -3.733333333x + x2 = 1.084444446

Factor a perfect square on the left side:
(x + -1.866666667)(x + -1.866666667) = 1.084444446

Calculate the square root of the right side: 1.041366624

Break this problem into two subproblems by setting 
(x + -1.866666667) equal to 1.041366624 and -1.041366624.

Subproblem 1

x + -1.866666667 = 1.041366624 Simplifying x + -1.866666667 = 1.041366624 Reorder the terms: -1.866666667 + x = 1.041366624 Solving -1.866666667 + x = 1.041366624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.866666667' to each side of the equation. -1.866666667 + 1.866666667 + x = 1.041366624 + 1.866666667 Combine like terms: -1.866666667 + 1.866666667 = 0.000000000 0.000000000 + x = 1.041366624 + 1.866666667 x = 1.041366624 + 1.866666667 Combine like terms: 1.041366624 + 1.866666667 = 2.908033291 x = 2.908033291 Simplifying x = 2.908033291

Subproblem 2

x + -1.866666667 = -1.041366624 Simplifying x + -1.866666667 = -1.041366624 Reorder the terms: -1.866666667 + x = -1.041366624 Solving -1.866666667 + x = -1.041366624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.866666667' to each side of the equation. -1.866666667 + 1.866666667 + x = -1.041366624 + 1.866666667 Combine like terms: -1.866666667 + 1.866666667 = 0.000000000 0.000000000 + x = -1.041366624 + 1.866666667 x = -1.041366624 + 1.866666667 Combine like terms: -1.041366624 + 1.866666667 = 0.825300043 x = 0.825300043 Simplifying x = 0.825300043

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.908033291, 0.825300043}

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