.2x+x^2=.99

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Solution for .2x+x^2=.99 equation:


Simplifying
0.2x + x2 = 0.99

Solving
0.2x + x2 = 0.99

Solving for variable 'x'.

Reorder the terms:
-0.99 + 0.2x + x2 = 0.99 + -0.99

Combine like terms: 0.99 + -0.99 = 0.00
-0.99 + 0.2x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '0.99' to each side of the equation.
-0.99 + 0.2x + 0.99 + x2 = 0.00 + 0.99

Reorder the terms:
-0.99 + 0.99 + 0.2x + x2 = 0.00 + 0.99

Combine like terms: -0.99 + 0.99 = 0.00
0.00 + 0.2x + x2 = 0.00 + 0.99
0.2x + x2 = 0.00 + 0.99

Combine like terms: 0.00 + 0.99 = 0.99
0.2x + x2 = 0.99

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 = 0.99 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 0.99 + 0.01

Combine like terms: 0.99 + 0.01 = 1
0.01 + 0.2x + x2 = 1

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 1

Calculate the square root of the right side: 1

Break this problem into two subproblems by setting 
(x + 0.1) equal to 1 and -1.

Subproblem 1

x + 0.1 = 1 Simplifying x + 0.1 = 1 Reorder the terms: 0.1 + x = 1 Solving 0.1 + x = 1 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 = 1 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 1 + -0.1 x = 1 + -0.1 Combine like terms: 1 + -0.1 = 0.9 x = 0.9 Simplifying x = 0.9

Subproblem 2

x + 0.1 = -1 Simplifying x + 0.1 = -1 Reorder the terms: 0.1 + x = -1 Solving 0.1 + x = -1 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 = -1 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -1 + -0.1 x = -1 + -0.1 Combine like terms: -1 + -0.1 = -1.1 x = -1.1 Simplifying x = -1.1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.9, -1.1}

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