11a^2-15a-25=0

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Solution for 11a^2-15a-25=0 equation:


Simplifying
11a2 + -15a + -25 = 0

Reorder the terms:
-25 + -15a + 11a2 = 0

Solving
-25 + -15a + 11a2 = 0

Solving for variable 'a'.

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

Divide each side by '11'.
-2.272727273 + -1.363636364a + a2 = 0

Move the constant term to the right:

Add '2.272727273' to each side of the equation.
-2.272727273 + -1.363636364a + 2.272727273 + a2 = 0 + 2.272727273

Reorder the terms:
-2.272727273 + 2.272727273 + -1.363636364a + a2 = 0 + 2.272727273

Combine like terms: -2.272727273 + 2.272727273 = 0.000000000
0.000000000 + -1.363636364a + a2 = 0 + 2.272727273
-1.363636364a + a2 = 0 + 2.272727273

Combine like terms: 0 + 2.272727273 = 2.272727273
-1.363636364a + a2 = 2.272727273

The a term is -1.363636364a.  Take half its coefficient (-0.681818182).
Square it (0.4648760333) and add it to both sides.

Add '0.4648760333' to each side of the equation.
-1.363636364a + 0.4648760333 + a2 = 2.272727273 + 0.4648760333

Reorder the terms:
0.4648760333 + -1.363636364a + a2 = 2.272727273 + 0.4648760333

Combine like terms: 2.272727273 + 0.4648760333 = 2.7376033063
0.4648760333 + -1.363636364a + a2 = 2.7376033063

Factor a perfect square on the left side:
(a + -0.681818182)(a + -0.681818182) = 2.7376033063

Calculate the square root of the right side: 1.65457043

Break this problem into two subproblems by setting 
(a + -0.681818182) equal to 1.65457043 and -1.65457043.

Subproblem 1

a + -0.681818182 = 1.65457043 Simplifying a + -0.681818182 = 1.65457043 Reorder the terms: -0.681818182 + a = 1.65457043 Solving -0.681818182 + a = 1.65457043 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.681818182' to each side of the equation. -0.681818182 + 0.681818182 + a = 1.65457043 + 0.681818182 Combine like terms: -0.681818182 + 0.681818182 = 0.000000000 0.000000000 + a = 1.65457043 + 0.681818182 a = 1.65457043 + 0.681818182 Combine like terms: 1.65457043 + 0.681818182 = 2.336388612 a = 2.336388612 Simplifying a = 2.336388612

Subproblem 2

a + -0.681818182 = -1.65457043 Simplifying a + -0.681818182 = -1.65457043 Reorder the terms: -0.681818182 + a = -1.65457043 Solving -0.681818182 + a = -1.65457043 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.681818182' to each side of the equation. -0.681818182 + 0.681818182 + a = -1.65457043 + 0.681818182 Combine like terms: -0.681818182 + 0.681818182 = 0.000000000 0.000000000 + a = -1.65457043 + 0.681818182 a = -1.65457043 + 0.681818182 Combine like terms: -1.65457043 + 0.681818182 = -0.972752248 a = -0.972752248 Simplifying a = -0.972752248

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.336388612, -0.972752248}

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