10x^2+2.2x-1=0

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Solution for 10x^2+2.2x-1=0 equation:


Simplifying
10x2 + 2.2x + -1 = 0

Reorder the terms:
-1 + 2.2x + 10x2 = 0

Solving
-1 + 2.2x + 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'.
-0.1 + 0.22x + x2 = 0

Move the constant term to the right:

Add '0.1' to each side of the equation.
-0.1 + 0.22x + 0.1 + x2 = 0 + 0.1

Reorder the terms:
-0.1 + 0.1 + 0.22x + x2 = 0 + 0.1

Combine like terms: -0.1 + 0.1 = 0.0
0.0 + 0.22x + x2 = 0 + 0.1
0.22x + x2 = 0 + 0.1

Combine like terms: 0 + 0.1 = 0.1
0.22x + x2 = 0.1

The x term is 0.22x.  Take half its coefficient (0.11).
Square it (0.0121) and add it to both sides.

Add '0.0121' to each side of the equation.
0.22x + 0.0121 + x2 = 0.1 + 0.0121

Reorder the terms:
0.0121 + 0.22x + x2 = 0.1 + 0.0121

Combine like terms: 0.1 + 0.0121 = 0.1121
0.0121 + 0.22x + x2 = 0.1121

Factor a perfect square on the left side:
(x + 0.11)(x + 0.11) = 0.1121

Calculate the square root of the right side: 0.334813381

Break this problem into two subproblems by setting 
(x + 0.11) equal to 0.334813381 and -0.334813381.

Subproblem 1

x + 0.11 = 0.334813381 Simplifying x + 0.11 = 0.334813381 Reorder the terms: 0.11 + x = 0.334813381 Solving 0.11 + x = 0.334813381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.11' to each side of the equation. 0.11 + -0.11 + x = 0.334813381 + -0.11 Combine like terms: 0.11 + -0.11 = 0.00 0.00 + x = 0.334813381 + -0.11 x = 0.334813381 + -0.11 Combine like terms: 0.334813381 + -0.11 = 0.224813381 x = 0.224813381 Simplifying x = 0.224813381

Subproblem 2

x + 0.11 = -0.334813381 Simplifying x + 0.11 = -0.334813381 Reorder the terms: 0.11 + x = -0.334813381 Solving 0.11 + x = -0.334813381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.11' to each side of the equation. 0.11 + -0.11 + x = -0.334813381 + -0.11 Combine like terms: 0.11 + -0.11 = 0.00 0.00 + x = -0.334813381 + -0.11 x = -0.334813381 + -0.11 Combine like terms: -0.334813381 + -0.11 = -0.444813381 x = -0.444813381 Simplifying x = -0.444813381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.224813381, -0.444813381}

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