12x^2-77x+15=0

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Solution for 12x^2-77x+15=0 equation:


Simplifying
12x2 + -77x + 15 = 0

Reorder the terms:
15 + -77x + 12x2 = 0

Solving
15 + -77x + 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'.
1.25 + -6.416666667x + x2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + -6.416666667x + -1.25 + x2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + -6.416666667x + x2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + -6.416666667x + x2 = 0 + -1.25
-6.416666667x + x2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
-6.416666667x + x2 = -1.25

The x term is -6.416666667x.  Take half its coefficient (-3.208333334).
Square it (10.29340278) and add it to both sides.

Add '10.29340278' to each side of the equation.
-6.416666667x + 10.29340278 + x2 = -1.25 + 10.29340278

Reorder the terms:
10.29340278 + -6.416666667x + x2 = -1.25 + 10.29340278

Combine like terms: -1.25 + 10.29340278 = 9.04340278
10.29340278 + -6.416666667x + x2 = 9.04340278

Factor a perfect square on the left side:
(x + -3.208333334)(x + -3.208333334) = 9.04340278

Calculate the square root of the right side: 3.007225096

Break this problem into two subproblems by setting 
(x + -3.208333334) equal to 3.007225096 and -3.007225096.

Subproblem 1

x + -3.208333334 = 3.007225096 Simplifying x + -3.208333334 = 3.007225096 Reorder the terms: -3.208333334 + x = 3.007225096 Solving -3.208333334 + x = 3.007225096 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.208333334' to each side of the equation. -3.208333334 + 3.208333334 + x = 3.007225096 + 3.208333334 Combine like terms: -3.208333334 + 3.208333334 = 0.000000000 0.000000000 + x = 3.007225096 + 3.208333334 x = 3.007225096 + 3.208333334 Combine like terms: 3.007225096 + 3.208333334 = 6.21555843 x = 6.21555843 Simplifying x = 6.21555843

Subproblem 2

x + -3.208333334 = -3.007225096 Simplifying x + -3.208333334 = -3.007225096 Reorder the terms: -3.208333334 + x = -3.007225096 Solving -3.208333334 + x = -3.007225096 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.208333334' to each side of the equation. -3.208333334 + 3.208333334 + x = -3.007225096 + 3.208333334 Combine like terms: -3.208333334 + 3.208333334 = 0.000000000 0.000000000 + x = -3.007225096 + 3.208333334 x = -3.007225096 + 3.208333334 Combine like terms: -3.007225096 + 3.208333334 = 0.201108238 x = 0.201108238 Simplifying x = 0.201108238

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.21555843, 0.201108238}

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