2a^2-11a=-1

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Solution for 2a^2-11a=-1 equation:


Simplifying
2a2 + -11a = -1

Reorder the terms:
-11a + 2a2 = -1

Solving
-11a + 2a2 = -1

Solving for variable 'a'.

Reorder the terms:
1 + -11a + 2a2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + -11a + 2a2 = 0

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

Divide each side by '2'.
0.5 + -5.5a + a2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -5.5a + -0.5 + a2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -5.5a + a2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -5.5a + a2 = 0 + -0.5
-5.5a + a2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-5.5a + a2 = -0.5

The a term is -5.5a.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5a + 7.5625 + a2 = -0.5 + 7.5625

Reorder the terms:
7.5625 + -5.5a + a2 = -0.5 + 7.5625

Combine like terms: -0.5 + 7.5625 = 7.0625
7.5625 + -5.5a + a2 = 7.0625

Factor a perfect square on the left side:
(a + -2.75)(a + -2.75) = 7.0625

Calculate the square root of the right side: 2.657536453

Break this problem into two subproblems by setting 
(a + -2.75) equal to 2.657536453 and -2.657536453.

Subproblem 1

a + -2.75 = 2.657536453 Simplifying a + -2.75 = 2.657536453 Reorder the terms: -2.75 + a = 2.657536453 Solving -2.75 + a = 2.657536453 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + a = 2.657536453 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + a = 2.657536453 + 2.75 a = 2.657536453 + 2.75 Combine like terms: 2.657536453 + 2.75 = 5.407536453 a = 5.407536453 Simplifying a = 5.407536453

Subproblem 2

a + -2.75 = -2.657536453 Simplifying a + -2.75 = -2.657536453 Reorder the terms: -2.75 + a = -2.657536453 Solving -2.75 + a = -2.657536453 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + a = -2.657536453 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + a = -2.657536453 + 2.75 a = -2.657536453 + 2.75 Combine like terms: -2.657536453 + 2.75 = 0.092463547 a = 0.092463547 Simplifying a = 0.092463547

Solution

The solution to the problem is based on the solutions from the subproblems. a = {5.407536453, 0.092463547}

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