a^2-6a-56=0

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Solution for a^2-6a-56=0 equation:


Simplifying
a2 + -6a + -56 = 0

Reorder the terms:
-56 + -6a + a2 = 0

Solving
-56 + -6a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + -6a + 56 + a2 = 0 + 56

Reorder the terms:
-56 + 56 + -6a + a2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + -6a + a2 = 0 + 56
-6a + a2 = 0 + 56

Combine like terms: 0 + 56 = 56
-6a + a2 = 56

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 = 56 + 9

Reorder the terms:
9 + -6a + a2 = 56 + 9

Combine like terms: 56 + 9 = 65
9 + -6a + a2 = 65

Factor a perfect square on the left side:
(a + -3)(a + -3) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(a + -3) equal to 8.062257748 and -8.062257748.

Subproblem 1

a + -3 = 8.062257748 Simplifying a + -3 = 8.062257748 Reorder the terms: -3 + a = 8.062257748 Solving -3 + a = 8.062257748 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 = 8.062257748 + 3 Combine like terms: -3 + 3 = 0 0 + a = 8.062257748 + 3 a = 8.062257748 + 3 Combine like terms: 8.062257748 + 3 = 11.062257748 a = 11.062257748 Simplifying a = 11.062257748

Subproblem 2

a + -3 = -8.062257748 Simplifying a + -3 = -8.062257748 Reorder the terms: -3 + a = -8.062257748 Solving -3 + a = -8.062257748 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 = -8.062257748 + 3 Combine like terms: -3 + 3 = 0 0 + a = -8.062257748 + 3 a = -8.062257748 + 3 Combine like terms: -8.062257748 + 3 = -5.062257748 a = -5.062257748 Simplifying a = -5.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. a = {11.062257748, -5.062257748}

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