5a^2+8a-6=0

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Solution for 5a^2+8a-6=0 equation:


Simplifying
5a2 + 8a + -6 = 0

Reorder the terms:
-6 + 8a + 5a2 = 0

Solving
-6 + 8a + 5a2 = 0

Solving for variable 'a'.

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

Divide each side by '5'.
-1.2 + 1.6a + a2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 1.6a + 1.2 + a2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 1.6a + a2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 1.6a + a2 = 0 + 1.2
1.6a + a2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
1.6a + a2 = 1.2

The a term is 1.6a.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6a + 0.64 + a2 = 1.2 + 0.64

Reorder the terms:
0.64 + 1.6a + a2 = 1.2 + 0.64

Combine like terms: 1.2 + 0.64 = 1.84
0.64 + 1.6a + a2 = 1.84

Factor a perfect square on the left side:
(a + 0.8)(a + 0.8) = 1.84

Calculate the square root of the right side: 1.356465997

Break this problem into two subproblems by setting 
(a + 0.8) equal to 1.356465997 and -1.356465997.

Subproblem 1

a + 0.8 = 1.356465997 Simplifying a + 0.8 = 1.356465997 Reorder the terms: 0.8 + a = 1.356465997 Solving 0.8 + a = 1.356465997 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + a = 1.356465997 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + a = 1.356465997 + -0.8 a = 1.356465997 + -0.8 Combine like terms: 1.356465997 + -0.8 = 0.556465997 a = 0.556465997 Simplifying a = 0.556465997

Subproblem 2

a + 0.8 = -1.356465997 Simplifying a + 0.8 = -1.356465997 Reorder the terms: 0.8 + a = -1.356465997 Solving 0.8 + a = -1.356465997 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + a = -1.356465997 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + a = -1.356465997 + -0.8 a = -1.356465997 + -0.8 Combine like terms: -1.356465997 + -0.8 = -2.156465997 a = -2.156465997 Simplifying a = -2.156465997

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.556465997, -2.156465997}

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