a^2-3a-27=0

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Solution for a^2-3a-27=0 equation:


Simplifying
a2 + -3a + -27 = 0

Reorder the terms:
-27 + -3a + a2 = 0

Solving
-27 + -3a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + -3a + 27 + a2 = 0 + 27

Reorder the terms:
-27 + 27 + -3a + a2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + -3a + a2 = 0 + 27
-3a + a2 = 0 + 27

Combine like terms: 0 + 27 = 27
-3a + a2 = 27

The a term is -3a.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3a + 2.25 + a2 = 27 + 2.25

Reorder the terms:
2.25 + -3a + a2 = 27 + 2.25

Combine like terms: 27 + 2.25 = 29.25
2.25 + -3a + a2 = 29.25

Factor a perfect square on the left side:
(a + -1.5)(a + -1.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(a + -1.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

a + -1.5 = 5.408326913 Simplifying a + -1.5 = 5.408326913 Reorder the terms: -1.5 + a = 5.408326913 Solving -1.5 + a = 5.408326913 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + a = 5.408326913 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + a = 5.408326913 + 1.5 a = 5.408326913 + 1.5 Combine like terms: 5.408326913 + 1.5 = 6.908326913 a = 6.908326913 Simplifying a = 6.908326913

Subproblem 2

a + -1.5 = -5.408326913 Simplifying a + -1.5 = -5.408326913 Reorder the terms: -1.5 + a = -5.408326913 Solving -1.5 + a = -5.408326913 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + a = -5.408326913 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + a = -5.408326913 + 1.5 a = -5.408326913 + 1.5 Combine like terms: -5.408326913 + 1.5 = -3.908326913 a = -3.908326913 Simplifying a = -3.908326913

Solution

The solution to the problem is based on the solutions from the subproblems. a = {6.908326913, -3.908326913}

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