10-x-x^2=1.6

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Solution for 10-x-x^2=1.6 equation:


Simplifying
10 + -1x + -1x2 = 1.6

Solving
10 + -1x + -1x2 = 1.6

Solving for variable 'x'.

Reorder the terms:
10 + -1.6 + -1x + -1x2 = 1.6 + -1.6

Combine like terms: 10 + -1.6 = 8.4
8.4 + -1x + -1x2 = 1.6 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
8.4 + -1x + -1x2 = 0.0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-8.4 + x + x2 = 0.0

Move the constant term to the right:

Add '8.4' to each side of the equation.
-8.4 + x + 8.4 + x2 = 0.0 + 8.4

Reorder the terms:
-8.4 + 8.4 + x + x2 = 0.0 + 8.4

Combine like terms: -8.4 + 8.4 = 0.0
0.0 + x + x2 = 0.0 + 8.4
x + x2 = 0.0 + 8.4

Combine like terms: 0.0 + 8.4 = 8.4
x + x2 = 8.4

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 8.4 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 8.4 + 0.25

Combine like terms: 8.4 + 0.25 = 8.65
1.25 + x2 = 8.65

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 8.65

Calculate the square root of the right side: 2.941088234

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.941088234 and -2.941088234.

Subproblem 1

x + 0.5 = 2.941088234 Simplifying x + 0.5 = 2.941088234 Reorder the terms: 0.5 + x = 2.941088234 Solving 0.5 + x = 2.941088234 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.941088234 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.941088234 + -0.5 x = 2.941088234 + -0.5 Combine like terms: 2.941088234 + -0.5 = 2.441088234 x = 2.441088234 Simplifying x = 2.441088234

Subproblem 2

x + 0.5 = -2.941088234 Simplifying x + 0.5 = -2.941088234 Reorder the terms: 0.5 + x = -2.941088234 Solving 0.5 + x = -2.941088234 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.941088234 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.941088234 + -0.5 x = -2.941088234 + -0.5 Combine like terms: -2.941088234 + -0.5 = -3.441088234 x = -3.441088234 Simplifying x = -3.441088234

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.441088234, -3.441088234}

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