15a^2+51a-26=0

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Solution for 15a^2+51a-26=0 equation:


Simplifying
15a2 + 51a + -26 = 0

Reorder the terms:
-26 + 51a + 15a2 = 0

Solving
-26 + 51a + 15a2 = 0

Solving for variable 'a'.

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

Divide each side by '15'.
-1.733333333 + 3.4a + a2 = 0

Move the constant term to the right:

Add '1.733333333' to each side of the equation.
-1.733333333 + 3.4a + 1.733333333 + a2 = 0 + 1.733333333

Reorder the terms:
-1.733333333 + 1.733333333 + 3.4a + a2 = 0 + 1.733333333

Combine like terms: -1.733333333 + 1.733333333 = 0.000000000
0.000000000 + 3.4a + a2 = 0 + 1.733333333
3.4a + a2 = 0 + 1.733333333

Combine like terms: 0 + 1.733333333 = 1.733333333
3.4a + a2 = 1.733333333

The a term is 3.4a.  Take half its coefficient (1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
3.4a + 2.89 + a2 = 1.733333333 + 2.89

Reorder the terms:
2.89 + 3.4a + a2 = 1.733333333 + 2.89

Combine like terms: 1.733333333 + 2.89 = 4.623333333
2.89 + 3.4a + a2 = 4.623333333

Factor a perfect square on the left side:
(a + 1.7)(a + 1.7) = 4.623333333

Calculate the square root of the right side: 2.15019379

Break this problem into two subproblems by setting 
(a + 1.7) equal to 2.15019379 and -2.15019379.

Subproblem 1

a + 1.7 = 2.15019379 Simplifying a + 1.7 = 2.15019379 Reorder the terms: 1.7 + a = 2.15019379 Solving 1.7 + a = 2.15019379 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + a = 2.15019379 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + a = 2.15019379 + -1.7 a = 2.15019379 + -1.7 Combine like terms: 2.15019379 + -1.7 = 0.45019379 a = 0.45019379 Simplifying a = 0.45019379

Subproblem 2

a + 1.7 = -2.15019379 Simplifying a + 1.7 = -2.15019379 Reorder the terms: 1.7 + a = -2.15019379 Solving 1.7 + a = -2.15019379 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + a = -2.15019379 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + a = -2.15019379 + -1.7 a = -2.15019379 + -1.7 Combine like terms: -2.15019379 + -1.7 = -3.85019379 a = -3.85019379 Simplifying a = -3.85019379

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.45019379, -3.85019379}

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