2a^2-11a-4=0

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Solution for 2a^2-11a-4=0 equation:


Simplifying
2a2 + -11a + -4 = 0

Reorder the terms:
-4 + -11a + 2a2 = 0

Solving
-4 + -11a + 2a2 = 0

Solving for variable 'a'.

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

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

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -5.5a + 2 + a2 = 0 + 2

Reorder the terms:
-2 + 2 + -5.5a + a2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -5.5a + a2 = 0 + 2
-5.5a + a2 = 0 + 2

Combine like terms: 0 + 2 = 2
-5.5a + a2 = 2

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 = 2 + 7.5625

Reorder the terms:
7.5625 + -5.5a + a2 = 2 + 7.5625

Combine like terms: 2 + 7.5625 = 9.5625
7.5625 + -5.5a + a2 = 9.5625

Factor a perfect square on the left side:
(a + -2.75)(a + -2.75) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(a + -2.75) equal to 3.092329219 and -3.092329219.

Subproblem 1

a + -2.75 = 3.092329219 Simplifying a + -2.75 = 3.092329219 Reorder the terms: -2.75 + a = 3.092329219 Solving -2.75 + a = 3.092329219 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 = 3.092329219 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + a = 3.092329219 + 2.75 a = 3.092329219 + 2.75 Combine like terms: 3.092329219 + 2.75 = 5.842329219 a = 5.842329219 Simplifying a = 5.842329219

Subproblem 2

a + -2.75 = -3.092329219 Simplifying a + -2.75 = -3.092329219 Reorder the terms: -2.75 + a = -3.092329219 Solving -2.75 + a = -3.092329219 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 = -3.092329219 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + a = -3.092329219 + 2.75 a = -3.092329219 + 2.75 Combine like terms: -3.092329219 + 2.75 = -0.342329219 a = -0.342329219 Simplifying a = -0.342329219

Solution

The solution to the problem is based on the solutions from the subproblems. a = {5.842329219, -0.342329219}

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