17-17a=-2a^2

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Solution for 17-17a=-2a^2 equation:


Simplifying
17 + -17a = -2a2

Solving
17 + -17a = -2a2

Solving for variable 'a'.

Combine like terms: -2a2 + 2a2 = 0
17 + -17a + 2a2 = 0

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

Divide each side by '2'.
8.5 + -8.5a + a2 = 0

Move the constant term to the right:

Add '-8.5' to each side of the equation.
8.5 + -8.5a + -8.5 + a2 = 0 + -8.5

Reorder the terms:
8.5 + -8.5 + -8.5a + a2 = 0 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
0.0 + -8.5a + a2 = 0 + -8.5
-8.5a + a2 = 0 + -8.5

Combine like terms: 0 + -8.5 = -8.5
-8.5a + a2 = -8.5

The a term is -8.5a.  Take half its coefficient (-4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
-8.5a + 18.0625 + a2 = -8.5 + 18.0625

Reorder the terms:
18.0625 + -8.5a + a2 = -8.5 + 18.0625

Combine like terms: -8.5 + 18.0625 = 9.5625
18.0625 + -8.5a + a2 = 9.5625

Factor a perfect square on the left side:
(a + -4.25)(a + -4.25) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(a + -4.25) equal to 3.092329219 and -3.092329219.

Subproblem 1

a + -4.25 = 3.092329219 Simplifying a + -4.25 = 3.092329219 Reorder the terms: -4.25 + a = 3.092329219 Solving -4.25 + a = 3.092329219 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + a = 3.092329219 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + a = 3.092329219 + 4.25 a = 3.092329219 + 4.25 Combine like terms: 3.092329219 + 4.25 = 7.342329219 a = 7.342329219 Simplifying a = 7.342329219

Subproblem 2

a + -4.25 = -3.092329219 Simplifying a + -4.25 = -3.092329219 Reorder the terms: -4.25 + a = -3.092329219 Solving -4.25 + a = -3.092329219 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + a = -3.092329219 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + a = -3.092329219 + 4.25 a = -3.092329219 + 4.25 Combine like terms: -3.092329219 + 4.25 = 1.157670781 a = 1.157670781 Simplifying a = 1.157670781

Solution

The solution to the problem is based on the solutions from the subproblems. a = {7.342329219, 1.157670781}

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