12x^2-21x+6.5=0

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Solution for 12x^2-21x+6.5=0 equation:


Simplifying
12x2 + -21x + 6.5 = 0

Reorder the terms:
6.5 + -21x + 12x2 = 0

Solving
6.5 + -21x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
0.5416666667 + -1.75x + x2 = 0

Move the constant term to the right:

Add '-0.5416666667' to each side of the equation.
0.5416666667 + -1.75x + -0.5416666667 + x2 = 0 + -0.5416666667

Reorder the terms:
0.5416666667 + -0.5416666667 + -1.75x + x2 = 0 + -0.5416666667

Combine like terms: 0.5416666667 + -0.5416666667 = 0.0000000000
0.0000000000 + -1.75x + x2 = 0 + -0.5416666667
-1.75x + x2 = 0 + -0.5416666667

Combine like terms: 0 + -0.5416666667 = -0.5416666667
-1.75x + x2 = -0.5416666667

The x term is -1.75x.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75x + 0.765625 + x2 = -0.5416666667 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = -0.5416666667 + 0.765625

Combine like terms: -0.5416666667 + 0.765625 = 0.2239583333
0.765625 + -1.75x + x2 = 0.2239583333

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = 0.2239583333

Calculate the square root of the right side: 0.473242362

Break this problem into two subproblems by setting 
(x + -0.875) equal to 0.473242362 and -0.473242362.

Subproblem 1

x + -0.875 = 0.473242362 Simplifying x + -0.875 = 0.473242362 Reorder the terms: -0.875 + x = 0.473242362 Solving -0.875 + x = 0.473242362 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = 0.473242362 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 0.473242362 + 0.875 x = 0.473242362 + 0.875 Combine like terms: 0.473242362 + 0.875 = 1.348242362 x = 1.348242362 Simplifying x = 1.348242362

Subproblem 2

x + -0.875 = -0.473242362 Simplifying x + -0.875 = -0.473242362 Reorder the terms: -0.875 + x = -0.473242362 Solving -0.875 + x = -0.473242362 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = -0.473242362 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -0.473242362 + 0.875 x = -0.473242362 + 0.875 Combine like terms: -0.473242362 + 0.875 = 0.401757638 x = 0.401757638 Simplifying x = 0.401757638

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.348242362, 0.401757638}

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