0=a^2-6a+7

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Solution for 0=a^2-6a+7 equation:


Simplifying
0 = a2 + -6a + 7

Reorder the terms:
0 = 7 + -6a + a2

Solving
0 = 7 + -6a + a2

Solving for variable 'a'.

Combine like terms: 0 + -7 = -7
-7 + 6a + -1a2 = 7 + -6a + a2 + -7 + 6a + -1a2

Reorder the terms:
-7 + 6a + -1a2 = 7 + -7 + -6a + 6a + a2 + -1a2

Combine like terms: 7 + -7 = 0
-7 + 6a + -1a2 = 0 + -6a + 6a + a2 + -1a2
-7 + 6a + -1a2 = -6a + 6a + a2 + -1a2

Combine like terms: -6a + 6a = 0
-7 + 6a + -1a2 = 0 + a2 + -1a2
-7 + 6a + -1a2 = a2 + -1a2

Combine like terms: a2 + -1a2 = 0
-7 + 6a + -1a2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
7 + -6a + a2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -6a + -7 + a2 = 0 + -7

Reorder the terms:
7 + -7 + -6a + a2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -6a + a2 = 0 + -7
-6a + a2 = 0 + -7

Combine like terms: 0 + -7 = -7
-6a + a2 = -7

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 = -7 + 9

Reorder the terms:
9 + -6a + a2 = -7 + 9

Combine like terms: -7 + 9 = 2
9 + -6a + a2 = 2

Factor a perfect square on the left side:
(a + -3)(a + -3) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(a + -3) equal to 1.414213562 and -1.414213562.

Subproblem 1

a + -3 = 1.414213562 Simplifying a + -3 = 1.414213562 Reorder the terms: -3 + a = 1.414213562 Solving -3 + a = 1.414213562 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 = 1.414213562 + 3 Combine like terms: -3 + 3 = 0 0 + a = 1.414213562 + 3 a = 1.414213562 + 3 Combine like terms: 1.414213562 + 3 = 4.414213562 a = 4.414213562 Simplifying a = 4.414213562

Subproblem 2

a + -3 = -1.414213562 Simplifying a + -3 = -1.414213562 Reorder the terms: -3 + a = -1.414213562 Solving -3 + a = -1.414213562 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 = -1.414213562 + 3 Combine like terms: -3 + 3 = 0 0 + a = -1.414213562 + 3 a = -1.414213562 + 3 Combine like terms: -1.414213562 + 3 = 1.585786438 a = 1.585786438 Simplifying a = 1.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.414213562, 1.585786438}

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