(10-x^2)=81x

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Solution for (10-x^2)=81x equation:


Simplifying
(10 + -1x2) = 81x

Remove parenthesis around (10 + -1x2)
10 + -1x2 = 81x

Solving
10 + -1x2 = 81x

Solving for variable 'x'.

Reorder the terms:
10 + -81x + -1x2 = 81x + -81x

Combine like terms: 81x + -81x = 0
10 + -81x + -1x2 = 0

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

Divide each side by '-1'.
-10 + 81x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 81x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + 81x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 81x + x2 = 0 + 10
81x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
81x + x2 = 10

The x term is 81x.  Take half its coefficient (40.5).
Square it (1640.25) and add it to both sides.

Add '1640.25' to each side of the equation.
81x + 1640.25 + x2 = 10 + 1640.25

Reorder the terms:
1640.25 + 81x + x2 = 10 + 1640.25

Combine like terms: 10 + 1640.25 = 1650.25
1640.25 + 81x + x2 = 1650.25

Factor a perfect square on the left side:
(x + 40.5)(x + 40.5) = 1650.25

Calculate the square root of the right side: 40.623269194

Break this problem into two subproblems by setting 
(x + 40.5) equal to 40.623269194 and -40.623269194.

Subproblem 1

x + 40.5 = 40.623269194 Simplifying x + 40.5 = 40.623269194 Reorder the terms: 40.5 + x = 40.623269194 Solving 40.5 + x = 40.623269194 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40.5' to each side of the equation. 40.5 + -40.5 + x = 40.623269194 + -40.5 Combine like terms: 40.5 + -40.5 = 0.0 0.0 + x = 40.623269194 + -40.5 x = 40.623269194 + -40.5 Combine like terms: 40.623269194 + -40.5 = 0.123269194 x = 0.123269194 Simplifying x = 0.123269194

Subproblem 2

x + 40.5 = -40.623269194 Simplifying x + 40.5 = -40.623269194 Reorder the terms: 40.5 + x = -40.623269194 Solving 40.5 + x = -40.623269194 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40.5' to each side of the equation. 40.5 + -40.5 + x = -40.623269194 + -40.5 Combine like terms: 40.5 + -40.5 = 0.0 0.0 + x = -40.623269194 + -40.5 x = -40.623269194 + -40.5 Combine like terms: -40.623269194 + -40.5 = -81.123269194 x = -81.123269194 Simplifying x = -81.123269194

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.123269194, -81.123269194}

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