2a^2+5a-6=0

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


Simplifying
2a2 + 5a + -6 = 0

Reorder the terms:
-6 + 5a + 2a2 = 0

Solving
-6 + 5a + 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 + 2.5a + a2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 2.5a + 3 + a2 = 0 + 3

Reorder the terms:
-3 + 3 + 2.5a + a2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 2.5a + a2 = 0 + 3
2.5a + a2 = 0 + 3

Combine like terms: 0 + 3 = 3
2.5a + a2 = 3

The a term is 2.5a.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5a + 1.5625 + a2 = 3 + 1.5625

Reorder the terms:
1.5625 + 2.5a + a2 = 3 + 1.5625

Combine like terms: 3 + 1.5625 = 4.5625
1.5625 + 2.5a + a2 = 4.5625

Factor a perfect square on the left side:
(a + 1.25)(a + 1.25) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(a + 1.25) equal to 2.136000936 and -2.136000936.

Subproblem 1

a + 1.25 = 2.136000936 Simplifying a + 1.25 = 2.136000936 Reorder the terms: 1.25 + a = 2.136000936 Solving 1.25 + a = 2.136000936 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + a = 2.136000936 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + a = 2.136000936 + -1.25 a = 2.136000936 + -1.25 Combine like terms: 2.136000936 + -1.25 = 0.886000936 a = 0.886000936 Simplifying a = 0.886000936

Subproblem 2

a + 1.25 = -2.136000936 Simplifying a + 1.25 = -2.136000936 Reorder the terms: 1.25 + a = -2.136000936 Solving 1.25 + a = -2.136000936 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + a = -2.136000936 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + a = -2.136000936 + -1.25 a = -2.136000936 + -1.25 Combine like terms: -2.136000936 + -1.25 = -3.386000936 a = -3.386000936 Simplifying a = -3.386000936

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.886000936, -3.386000936}

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