2a^2+17a+6=0

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Solution for 2a^2+17a+6=0 equation:


Simplifying
2a2 + 17a + 6 = 0

Reorder the terms:
6 + 17a + 2a2 = 0

Solving
6 + 17a + 2a2 = 0

Solving for variable 'a'.

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

Divide each side by '2'.
3 + 8.5a + a2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 8.5a + -3 + a2 = 0 + -3

Reorder the terms:
3 + -3 + 8.5a + a2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 8.5a + a2 = 0 + -3
8.5a + a2 = 0 + -3

Combine like terms: 0 + -3 = -3
8.5a + a2 = -3

The a term is 8.5a.  Take half its coefficient (4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
8.5a + 18.0625 + a2 = -3 + 18.0625

Reorder the terms:
18.0625 + 8.5a + a2 = -3 + 18.0625

Combine like terms: -3 + 18.0625 = 15.0625
18.0625 + 8.5a + a2 = 15.0625

Factor a perfect square on the left side:
(a + 4.25)(a + 4.25) = 15.0625

Calculate the square root of the right side: 3.881043674

Break this problem into two subproblems by setting 
(a + 4.25) equal to 3.881043674 and -3.881043674.

Subproblem 1

a + 4.25 = 3.881043674 Simplifying a + 4.25 = 3.881043674 Reorder the terms: 4.25 + a = 3.881043674 Solving 4.25 + a = 3.881043674 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + a = 3.881043674 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + a = 3.881043674 + -4.25 a = 3.881043674 + -4.25 Combine like terms: 3.881043674 + -4.25 = -0.368956326 a = -0.368956326 Simplifying a = -0.368956326

Subproblem 2

a + 4.25 = -3.881043674 Simplifying a + 4.25 = -3.881043674 Reorder the terms: 4.25 + a = -3.881043674 Solving 4.25 + a = -3.881043674 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + a = -3.881043674 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + a = -3.881043674 + -4.25 a = -3.881043674 + -4.25 Combine like terms: -3.881043674 + -4.25 = -8.131043674 a = -8.131043674 Simplifying a = -8.131043674

Solution

The solution to the problem is based on the solutions from the subproblems. a = {-0.368956326, -8.131043674}

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