3a^2+6a-28=

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Solution for 3a^2+6a-28= equation:


Simplifying
3a2 + 6a + -28 = 0

Reorder the terms:
-28 + 6a + 3a2 = 0

Solving
-28 + 6a + 3a2 = 0

Solving for variable 'a'.

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

Divide each side by '3'.
-9.333333333 + 2a + a2 = 0

Move the constant term to the right:

Add '9.333333333' to each side of the equation.
-9.333333333 + 2a + 9.333333333 + a2 = 0 + 9.333333333

Reorder the terms:
-9.333333333 + 9.333333333 + 2a + a2 = 0 + 9.333333333

Combine like terms: -9.333333333 + 9.333333333 = 0.000000000
0.000000000 + 2a + a2 = 0 + 9.333333333
2a + a2 = 0 + 9.333333333

Combine like terms: 0 + 9.333333333 = 9.333333333
2a + a2 = 9.333333333

The a term is 2a.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2a + 1 + a2 = 9.333333333 + 1

Reorder the terms:
1 + 2a + a2 = 9.333333333 + 1

Combine like terms: 9.333333333 + 1 = 10.333333333
1 + 2a + a2 = 10.333333333

Factor a perfect square on the left side:
(a + 1)(a + 1) = 10.333333333

Calculate the square root of the right side: 3.214550254

Break this problem into two subproblems by setting 
(a + 1) equal to 3.214550254 and -3.214550254.

Subproblem 1

a + 1 = 3.214550254 Simplifying a + 1 = 3.214550254 Reorder the terms: 1 + a = 3.214550254 Solving 1 + a = 3.214550254 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = 3.214550254 + -1 Combine like terms: 1 + -1 = 0 0 + a = 3.214550254 + -1 a = 3.214550254 + -1 Combine like terms: 3.214550254 + -1 = 2.214550254 a = 2.214550254 Simplifying a = 2.214550254

Subproblem 2

a + 1 = -3.214550254 Simplifying a + 1 = -3.214550254 Reorder the terms: 1 + a = -3.214550254 Solving 1 + a = -3.214550254 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = -3.214550254 + -1 Combine like terms: 1 + -1 = 0 0 + a = -3.214550254 + -1 a = -3.214550254 + -1 Combine like terms: -3.214550254 + -1 = -4.214550254 a = -4.214550254 Simplifying a = -4.214550254

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.214550254, -4.214550254}

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