a(a-8)=17-a

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Solution for a(a-8)=17-a equation:


Simplifying
a(a + -8) = 17 + -1a

Reorder the terms:
a(-8 + a) = 17 + -1a
(-8 * a + a * a) = 17 + -1a
(-8a + a2) = 17 + -1a

Solving
-8a + a2 = 17 + -1a

Solving for variable 'a'.

Reorder the terms:
-17 + -8a + a + a2 = 17 + -1a + -17 + a

Combine like terms: -8a + a = -7a
-17 + -7a + a2 = 17 + -1a + -17 + a

Reorder the terms:
-17 + -7a + a2 = 17 + -17 + -1a + a

Combine like terms: 17 + -17 = 0
-17 + -7a + a2 = 0 + -1a + a
-17 + -7a + a2 = -1a + a

Combine like terms: -1a + a = 0
-17 + -7a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + -7a + 17 + a2 = 0 + 17

Reorder the terms:
-17 + 17 + -7a + a2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -7a + a2 = 0 + 17
-7a + a2 = 0 + 17

Combine like terms: 0 + 17 = 17
-7a + a2 = 17

The a term is -7a.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7a + 12.25 + a2 = 17 + 12.25

Reorder the terms:
12.25 + -7a + a2 = 17 + 12.25

Combine like terms: 17 + 12.25 = 29.25
12.25 + -7a + a2 = 29.25

Factor a perfect square on the left side:
(a + -3.5)(a + -3.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(a + -3.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

a + -3.5 = 5.408326913 Simplifying a + -3.5 = 5.408326913 Reorder the terms: -3.5 + a = 5.408326913 Solving -3.5 + a = 5.408326913 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + a = 5.408326913 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + a = 5.408326913 + 3.5 a = 5.408326913 + 3.5 Combine like terms: 5.408326913 + 3.5 = 8.908326913 a = 8.908326913 Simplifying a = 8.908326913

Subproblem 2

a + -3.5 = -5.408326913 Simplifying a + -3.5 = -5.408326913 Reorder the terms: -3.5 + a = -5.408326913 Solving -3.5 + a = -5.408326913 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + a = -5.408326913 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + a = -5.408326913 + 3.5 a = -5.408326913 + 3.5 Combine like terms: -5.408326913 + 3.5 = -1.908326913 a = -1.908326913 Simplifying a = -1.908326913

Solution

The solution to the problem is based on the solutions from the subproblems. a = {8.908326913, -1.908326913}

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