4a^2-11a-2=0

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


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

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

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

Solving for variable 'a'.

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

Divide each side by '4'.
-0.5 + -2.75a + a2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -2.75a + 0.5 + a2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -2.75a + a2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -2.75a + a2 = 0 + 0.5
-2.75a + a2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-2.75a + a2 = 0.5

The a term is -2.75a.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75a + 1.890625 + a2 = 0.5 + 1.890625

Reorder the terms:
1.890625 + -2.75a + a2 = 0.5 + 1.890625

Combine like terms: 0.5 + 1.890625 = 2.390625
1.890625 + -2.75a + a2 = 2.390625

Factor a perfect square on the left side:
(a + -1.375)(a + -1.375) = 2.390625

Calculate the square root of the right side: 1.54616461

Break this problem into two subproblems by setting 
(a + -1.375) equal to 1.54616461 and -1.54616461.

Subproblem 1

a + -1.375 = 1.54616461 Simplifying a + -1.375 = 1.54616461 Reorder the terms: -1.375 + a = 1.54616461 Solving -1.375 + a = 1.54616461 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + a = 1.54616461 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + a = 1.54616461 + 1.375 a = 1.54616461 + 1.375 Combine like terms: 1.54616461 + 1.375 = 2.92116461 a = 2.92116461 Simplifying a = 2.92116461

Subproblem 2

a + -1.375 = -1.54616461 Simplifying a + -1.375 = -1.54616461 Reorder the terms: -1.375 + a = -1.54616461 Solving -1.375 + a = -1.54616461 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + a = -1.54616461 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + a = -1.54616461 + 1.375 a = -1.54616461 + 1.375 Combine like terms: -1.54616461 + 1.375 = -0.17116461 a = -0.17116461 Simplifying a = -0.17116461

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.92116461, -0.17116461}

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