3a^2-10a-12=0

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Solution for 3a^2-10a-12=0 equation:


Simplifying
3a2 + -10a + -12 = 0

Reorder the terms:
-12 + -10a + 3a2 = 0

Solving
-12 + -10a + 3a2 = 0

Solving for variable 'a'.

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

Divide each side by '3'.
-4 + -3.333333333a + a2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -3.333333333a + 4 + a2 = 0 + 4

Reorder the terms:
-4 + 4 + -3.333333333a + a2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -3.333333333a + a2 = 0 + 4
-3.333333333a + a2 = 0 + 4

Combine like terms: 0 + 4 = 4
-3.333333333a + a2 = 4

The a term is -3.333333333a.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333a + 2.777777779 + a2 = 4 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333a + a2 = 4 + 2.777777779

Combine like terms: 4 + 2.777777779 = 6.777777779
2.777777779 + -3.333333333a + a2 = 6.777777779

Factor a perfect square on the left side:
(a + -1.666666667)(a + -1.666666667) = 6.777777779

Calculate the square root of the right side: 2.603416559

Break this problem into two subproblems by setting 
(a + -1.666666667) equal to 2.603416559 and -2.603416559.

Subproblem 1

a + -1.666666667 = 2.603416559 Simplifying a + -1.666666667 = 2.603416559 Reorder the terms: -1.666666667 + a = 2.603416559 Solving -1.666666667 + a = 2.603416559 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + a = 2.603416559 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + a = 2.603416559 + 1.666666667 a = 2.603416559 + 1.666666667 Combine like terms: 2.603416559 + 1.666666667 = 4.270083226 a = 4.270083226 Simplifying a = 4.270083226

Subproblem 2

a + -1.666666667 = -2.603416559 Simplifying a + -1.666666667 = -2.603416559 Reorder the terms: -1.666666667 + a = -2.603416559 Solving -1.666666667 + a = -2.603416559 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + a = -2.603416559 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + a = -2.603416559 + 1.666666667 a = -2.603416559 + 1.666666667 Combine like terms: -2.603416559 + 1.666666667 = -0.936749892 a = -0.936749892 Simplifying a = -0.936749892

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.270083226, -0.936749892}

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