100-x^2=x+2

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Solution for 100-x^2=x+2 equation:


Simplifying
100 + -1x2 = x + 2

Reorder the terms:
100 + -1x2 = 2 + x

Solving
100 + -1x2 = 2 + x

Solving for variable 'x'.

Reorder the terms:
100 + -2 + -1x + -1x2 = 2 + x + -2 + -1x

Combine like terms: 100 + -2 = 98
98 + -1x + -1x2 = 2 + x + -2 + -1x

Reorder the terms:
98 + -1x + -1x2 = 2 + -2 + x + -1x

Combine like terms: 2 + -2 = 0
98 + -1x + -1x2 = 0 + x + -1x
98 + -1x + -1x2 = x + -1x

Combine like terms: x + -1x = 0
98 + -1x + -1x2 = 0

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

Divide each side by '-1'.
-98 + x + x2 = 0

Move the constant term to the right:

Add '98' to each side of the equation.
-98 + x + 98 + x2 = 0 + 98

Reorder the terms:
-98 + 98 + x + x2 = 0 + 98

Combine like terms: -98 + 98 = 0
0 + x + x2 = 0 + 98
x + x2 = 0 + 98

Combine like terms: 0 + 98 = 98
x + x2 = 98

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 = 98 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 98 + 0.25

Combine like terms: 98 + 0.25 = 98.25
1.25 + x2 = 98.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 98.25

Calculate the square root of the right side: 9.912113801

Break this problem into two subproblems by setting 
(x + 0.5) equal to 9.912113801 and -9.912113801.

Subproblem 1

x + 0.5 = 9.912113801 Simplifying x + 0.5 = 9.912113801 Reorder the terms: 0.5 + x = 9.912113801 Solving 0.5 + x = 9.912113801 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 = 9.912113801 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 9.912113801 + -0.5 x = 9.912113801 + -0.5 Combine like terms: 9.912113801 + -0.5 = 9.412113801 x = 9.412113801 Simplifying x = 9.412113801

Subproblem 2

x + 0.5 = -9.912113801 Simplifying x + 0.5 = -9.912113801 Reorder the terms: 0.5 + x = -9.912113801 Solving 0.5 + x = -9.912113801 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 = -9.912113801 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -9.912113801 + -0.5 x = -9.912113801 + -0.5 Combine like terms: -9.912113801 + -0.5 = -10.412113801 x = -10.412113801 Simplifying x = -10.412113801

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.412113801, -10.412113801}

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