5a^2+30a-11=0

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Solution for 5a^2+30a-11=0 equation:


Simplifying
5a2 + 30a + -11 = 0

Reorder the terms:
-11 + 30a + 5a2 = 0

Solving
-11 + 30a + 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'.
-2.2 + 6a + a2 = 0

Move the constant term to the right:

Add '2.2' to each side of the equation.
-2.2 + 6a + 2.2 + a2 = 0 + 2.2

Reorder the terms:
-2.2 + 2.2 + 6a + a2 = 0 + 2.2

Combine like terms: -2.2 + 2.2 = 0.0
0.0 + 6a + a2 = 0 + 2.2
6a + a2 = 0 + 2.2

Combine like terms: 0 + 2.2 = 2.2
6a + a2 = 2.2

The a term is 6a.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6a + 9 + a2 = 2.2 + 9

Reorder the terms:
9 + 6a + a2 = 2.2 + 9

Combine like terms: 2.2 + 9 = 11.2
9 + 6a + a2 = 11.2

Factor a perfect square on the left side:
(a + 3)(a + 3) = 11.2

Calculate the square root of the right side: 3.346640106

Break this problem into two subproblems by setting 
(a + 3) equal to 3.346640106 and -3.346640106.

Subproblem 1

a + 3 = 3.346640106 Simplifying a + 3 = 3.346640106 Reorder the terms: 3 + a = 3.346640106 Solving 3 + a = 3.346640106 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + a = 3.346640106 + -3 Combine like terms: 3 + -3 = 0 0 + a = 3.346640106 + -3 a = 3.346640106 + -3 Combine like terms: 3.346640106 + -3 = 0.346640106 a = 0.346640106 Simplifying a = 0.346640106

Subproblem 2

a + 3 = -3.346640106 Simplifying a + 3 = -3.346640106 Reorder the terms: 3 + a = -3.346640106 Solving 3 + a = -3.346640106 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + a = -3.346640106 + -3 Combine like terms: 3 + -3 = 0 0 + a = -3.346640106 + -3 a = -3.346640106 + -3 Combine like terms: -3.346640106 + -3 = -6.346640106 a = -6.346640106 Simplifying a = -6.346640106

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.346640106, -6.346640106}

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