a^2-16a=64

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Solution for a^2-16a=64 equation:


Simplifying
a2 + -16a = 64

Reorder the terms:
-16a + a2 = 64

Solving
-16a + a2 = 64

Solving for variable 'a'.

Reorder the terms:
-64 + -16a + a2 = 64 + -64

Combine like terms: 64 + -64 = 0
-64 + -16a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -16a + 64 + a2 = 0 + 64

Reorder the terms:
-64 + 64 + -16a + a2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -16a + a2 = 0 + 64
-16a + a2 = 0 + 64

Combine like terms: 0 + 64 = 64
-16a + a2 = 64

The a term is -16a.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16a + 64 + a2 = 64 + 64

Reorder the terms:
64 + -16a + a2 = 64 + 64

Combine like terms: 64 + 64 = 128
64 + -16a + a2 = 128

Factor a perfect square on the left side:
(a + -8)(a + -8) = 128

Calculate the square root of the right side: 11.313708499

Break this problem into two subproblems by setting 
(a + -8) equal to 11.313708499 and -11.313708499.

Subproblem 1

a + -8 = 11.313708499 Simplifying a + -8 = 11.313708499 Reorder the terms: -8 + a = 11.313708499 Solving -8 + a = 11.313708499 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + a = 11.313708499 + 8 Combine like terms: -8 + 8 = 0 0 + a = 11.313708499 + 8 a = 11.313708499 + 8 Combine like terms: 11.313708499 + 8 = 19.313708499 a = 19.313708499 Simplifying a = 19.313708499

Subproblem 2

a + -8 = -11.313708499 Simplifying a + -8 = -11.313708499 Reorder the terms: -8 + a = -11.313708499 Solving -8 + a = -11.313708499 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + a = -11.313708499 + 8 Combine like terms: -8 + 8 = 0 0 + a = -11.313708499 + 8 a = -11.313708499 + 8 Combine like terms: -11.313708499 + 8 = -3.313708499 a = -3.313708499 Simplifying a = -3.313708499

Solution

The solution to the problem is based on the solutions from the subproblems. a = {19.313708499, -3.313708499}

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