a^2-8a+4=0

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Solution for a^2-8a+4=0 equation:


Simplifying
a2 + -8a + 4 = 0

Reorder the terms:
4 + -8a + a2 = 0

Solving
4 + -8a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -8a + -4 + a2 = 0 + -4

Reorder the terms:
4 + -4 + -8a + a2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -8a + a2 = 0 + -4
-8a + a2 = 0 + -4

Combine like terms: 0 + -4 = -4
-8a + a2 = -4

The a term is -8a.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8a + 16 + a2 = -4 + 16

Reorder the terms:
16 + -8a + a2 = -4 + 16

Combine like terms: -4 + 16 = 12
16 + -8a + a2 = 12

Factor a perfect square on the left side:
(a + -4)(a + -4) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(a + -4) equal to 3.464101615 and -3.464101615.

Subproblem 1

a + -4 = 3.464101615 Simplifying a + -4 = 3.464101615 Reorder the terms: -4 + a = 3.464101615 Solving -4 + a = 3.464101615 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + a = 3.464101615 + 4 Combine like terms: -4 + 4 = 0 0 + a = 3.464101615 + 4 a = 3.464101615 + 4 Combine like terms: 3.464101615 + 4 = 7.464101615 a = 7.464101615 Simplifying a = 7.464101615

Subproblem 2

a + -4 = -3.464101615 Simplifying a + -4 = -3.464101615 Reorder the terms: -4 + a = -3.464101615 Solving -4 + a = -3.464101615 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + a = -3.464101615 + 4 Combine like terms: -4 + 4 = 0 0 + a = -3.464101615 + 4 a = -3.464101615 + 4 Combine like terms: -3.464101615 + 4 = 0.535898385 a = 0.535898385 Simplifying a = 0.535898385

Solution

The solution to the problem is based on the solutions from the subproblems. a = {7.464101615, 0.535898385}

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