a^2-4a-24=0

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Solution for a^2-4a-24=0 equation:


Simplifying
a2 + -4a + -24 = 0

Reorder the terms:
-24 + -4a + a2 = 0

Solving
-24 + -4a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -4a + 24 + a2 = 0 + 24

Reorder the terms:
-24 + 24 + -4a + a2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -4a + a2 = 0 + 24
-4a + a2 = 0 + 24

Combine like terms: 0 + 24 = 24
-4a + a2 = 24

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 = 24 + 4

Reorder the terms:
4 + -4a + a2 = 24 + 4

Combine like terms: 24 + 4 = 28
4 + -4a + a2 = 28

Factor a perfect square on the left side:
(a + -2)(a + -2) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(a + -2) equal to 5.291502622 and -5.291502622.

Subproblem 1

a + -2 = 5.291502622 Simplifying a + -2 = 5.291502622 Reorder the terms: -2 + a = 5.291502622 Solving -2 + a = 5.291502622 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 = 5.291502622 + 2 Combine like terms: -2 + 2 = 0 0 + a = 5.291502622 + 2 a = 5.291502622 + 2 Combine like terms: 5.291502622 + 2 = 7.291502622 a = 7.291502622 Simplifying a = 7.291502622

Subproblem 2

a + -2 = -5.291502622 Simplifying a + -2 = -5.291502622 Reorder the terms: -2 + a = -5.291502622 Solving -2 + a = -5.291502622 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 = -5.291502622 + 2 Combine like terms: -2 + 2 = 0 0 + a = -5.291502622 + 2 a = -5.291502622 + 2 Combine like terms: -5.291502622 + 2 = -3.291502622 a = -3.291502622 Simplifying a = -3.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. a = {7.291502622, -3.291502622}

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