a^2-9=6a

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Solution for a^2-9=6a equation:


Simplifying
a2 + -9 = 6a

Reorder the terms:
-9 + a2 = 6a

Solving
-9 + a2 = 6a

Solving for variable 'a'.

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

Combine like terms: 6a + -6a = 0
-9 + -6a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -6a + 9 + a2 = 0 + 9

Reorder the terms:
-9 + 9 + -6a + a2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -6a + a2 = 0 + 9
-6a + a2 = 0 + 9

Combine like terms: 0 + 9 = 9
-6a + a2 = 9

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 = 9 + 9

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

Combine like terms: 9 + 9 = 18
9 + -6a + a2 = 18

Factor a perfect square on the left side:
(a + -3)(a + -3) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(a + -3) equal to 4.242640687 and -4.242640687.

Subproblem 1

a + -3 = 4.242640687 Simplifying a + -3 = 4.242640687 Reorder the terms: -3 + a = 4.242640687 Solving -3 + a = 4.242640687 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 = 4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + a = 4.242640687 + 3 a = 4.242640687 + 3 Combine like terms: 4.242640687 + 3 = 7.242640687 a = 7.242640687 Simplifying a = 7.242640687

Subproblem 2

a + -3 = -4.242640687 Simplifying a + -3 = -4.242640687 Reorder the terms: -3 + a = -4.242640687 Solving -3 + a = -4.242640687 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 = -4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + a = -4.242640687 + 3 a = -4.242640687 + 3 Combine like terms: -4.242640687 + 3 = -1.242640687 a = -1.242640687 Simplifying a = -1.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. a = {7.242640687, -1.242640687}

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