2a^2+8a-33=0

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Solution for 2a^2+8a-33=0 equation:


Simplifying
2a2 + 8a + -33 = 0

Reorder the terms:
-33 + 8a + 2a2 = 0

Solving
-33 + 8a + 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'.
-16.5 + 4a + a2 = 0

Move the constant term to the right:

Add '16.5' to each side of the equation.
-16.5 + 4a + 16.5 + a2 = 0 + 16.5

Reorder the terms:
-16.5 + 16.5 + 4a + a2 = 0 + 16.5

Combine like terms: -16.5 + 16.5 = 0.0
0.0 + 4a + a2 = 0 + 16.5
4a + a2 = 0 + 16.5

Combine like terms: 0 + 16.5 = 16.5
4a + a2 = 16.5

The a term is 4a.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4a + 4 + a2 = 16.5 + 4

Reorder the terms:
4 + 4a + a2 = 16.5 + 4

Combine like terms: 16.5 + 4 = 20.5
4 + 4a + a2 = 20.5

Factor a perfect square on the left side:
(a + 2)(a + 2) = 20.5

Calculate the square root of the right side: 4.527692569

Break this problem into two subproblems by setting 
(a + 2) equal to 4.527692569 and -4.527692569.

Subproblem 1

a + 2 = 4.527692569 Simplifying a + 2 = 4.527692569 Reorder the terms: 2 + a = 4.527692569 Solving 2 + a = 4.527692569 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + a = 4.527692569 + -2 Combine like terms: 2 + -2 = 0 0 + a = 4.527692569 + -2 a = 4.527692569 + -2 Combine like terms: 4.527692569 + -2 = 2.527692569 a = 2.527692569 Simplifying a = 2.527692569

Subproblem 2

a + 2 = -4.527692569 Simplifying a + 2 = -4.527692569 Reorder the terms: 2 + a = -4.527692569 Solving 2 + a = -4.527692569 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + a = -4.527692569 + -2 Combine like terms: 2 + -2 = 0 0 + a = -4.527692569 + -2 a = -4.527692569 + -2 Combine like terms: -4.527692569 + -2 = -6.527692569 a = -6.527692569 Simplifying a = -6.527692569

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.527692569, -6.527692569}

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