10X^2-2X-115=0

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Solution for 10X^2-2X-115=0 equation:


Simplifying
10X2 + -2X + -115 = 0

Reorder the terms:
-115 + -2X + 10X2 = 0

Solving
-115 + -2X + 10X2 = 0

Solving for variable 'X'.

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

Divide each side by '10'.
-11.5 + -0.2X + X2 = 0

Move the constant term to the right:

Add '11.5' to each side of the equation.
-11.5 + -0.2X + 11.5 + X2 = 0 + 11.5

Reorder the terms:
-11.5 + 11.5 + -0.2X + X2 = 0 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
0.0 + -0.2X + X2 = 0 + 11.5
-0.2X + X2 = 0 + 11.5

Combine like terms: 0 + 11.5 = 11.5
-0.2X + X2 = 11.5

The X term is -0.2X.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2X + 0.01 + X2 = 11.5 + 0.01

Reorder the terms:
0.01 + -0.2X + X2 = 11.5 + 0.01

Combine like terms: 11.5 + 0.01 = 11.51
0.01 + -0.2X + X2 = 11.51

Factor a perfect square on the left side:
(X + -0.1)(X + -0.1) = 11.51

Calculate the square root of the right side: 3.392639091

Break this problem into two subproblems by setting 
(X + -0.1) equal to 3.392639091 and -3.392639091.

Subproblem 1

X + -0.1 = 3.392639091 Simplifying X + -0.1 = 3.392639091 Reorder the terms: -0.1 + X = 3.392639091 Solving -0.1 + X = 3.392639091 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + X = 3.392639091 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + X = 3.392639091 + 0.1 X = 3.392639091 + 0.1 Combine like terms: 3.392639091 + 0.1 = 3.492639091 X = 3.492639091 Simplifying X = 3.492639091

Subproblem 2

X + -0.1 = -3.392639091 Simplifying X + -0.1 = -3.392639091 Reorder the terms: -0.1 + X = -3.392639091 Solving -0.1 + X = -3.392639091 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + X = -3.392639091 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + X = -3.392639091 + 0.1 X = -3.392639091 + 0.1 Combine like terms: -3.392639091 + 0.1 = -3.292639091 X = -3.292639091 Simplifying X = -3.292639091

Solution

The solution to the problem is based on the solutions from the subproblems. X = {3.492639091, -3.292639091}

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