1=-0.1x^2+x+0.1

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Solution for 1=-0.1x^2+x+0.1 equation:


Simplifying
1 = -0.1x2 + x + 0.1

Reorder the terms:
1 = 0.1 + x + -0.1x2

Solving
1 = 0.1 + x + -0.1x2

Solving for variable 'x'.

Combine like terms: 1 + -0.1 = 0.9
0.9 + -1x + 0.1x2 = 0.1 + x + -0.1x2 + -0.1 + -1x + 0.1x2

Reorder the terms:
0.9 + -1x + 0.1x2 = 0.1 + -0.1 + x + -1x + -0.1x2 + 0.1x2

Combine like terms: 0.1 + -0.1 = 0.0
0.9 + -1x + 0.1x2 = 0.0 + x + -1x + -0.1x2 + 0.1x2
0.9 + -1x + 0.1x2 = x + -1x + -0.1x2 + 0.1x2

Combine like terms: x + -1x = 0
0.9 + -1x + 0.1x2 = 0 + -0.1x2 + 0.1x2
0.9 + -1x + 0.1x2 = -0.1x2 + 0.1x2

Combine like terms: -0.1x2 + 0.1x2 = 0.0
0.9 + -1x + 0.1x2 = 0.0

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

Divide each side by '0.1'.
9 + -10x + x2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -10x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -10x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -10x + x2 = 0 + -9
-10x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-10x + x2 = -9

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -9 + 25

Reorder the terms:
25 + -10x + x2 = -9 + 25

Combine like terms: -9 + 25 = 16
25 + -10x + x2 = 16

Factor a perfect square on the left side:
(x + -5)(x + -5) = 16

Calculate the square root of the right side: 4

Break this problem into two subproblems by setting 
(x + -5) equal to 4 and -4.

Subproblem 1

x + -5 = 4 Simplifying x + -5 = 4 Reorder the terms: -5 + x = 4 Solving -5 + x = 4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 4 + 5 Combine like terms: -5 + 5 = 0 0 + x = 4 + 5 x = 4 + 5 Combine like terms: 4 + 5 = 9 x = 9 Simplifying x = 9

Subproblem 2

x + -5 = -4 Simplifying x + -5 = -4 Reorder the terms: -5 + x = -4 Solving -5 + x = -4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -4 + 5 Combine like terms: -5 + 5 = 0 0 + x = -4 + 5 x = -4 + 5 Combine like terms: -4 + 5 = 1 x = 1 Simplifying x = 1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9, 1}

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