64x=81-x^2

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Solution for 64x=81-x^2 equation:


Simplifying
64x = 81 + -1x2

Solving
64x = 81 + -1x2

Solving for variable 'x'.

Reorder the terms:
-81 + 64x + x2 = 81 + -1x2 + -81 + x2

Reorder the terms:
-81 + 64x + x2 = 81 + -81 + -1x2 + x2

Combine like terms: 81 + -81 = 0
-81 + 64x + x2 = 0 + -1x2 + x2
-81 + 64x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-81 + 64x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '81' to each side of the equation.
-81 + 64x + 81 + x2 = 0 + 81

Reorder the terms:
-81 + 81 + 64x + x2 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + 64x + x2 = 0 + 81
64x + x2 = 0 + 81

Combine like terms: 0 + 81 = 81
64x + x2 = 81

The x term is 64x.  Take half its coefficient (32).
Square it (1024) and add it to both sides.

Add '1024' to each side of the equation.
64x + 1024 + x2 = 81 + 1024

Reorder the terms:
1024 + 64x + x2 = 81 + 1024

Combine like terms: 81 + 1024 = 1105
1024 + 64x + x2 = 1105

Factor a perfect square on the left side:
(x + 32)(x + 32) = 1105

Calculate the square root of the right side: 33.241540277

Break this problem into two subproblems by setting 
(x + 32) equal to 33.241540277 and -33.241540277.

Subproblem 1

x + 32 = 33.241540277 Simplifying x + 32 = 33.241540277 Reorder the terms: 32 + x = 33.241540277 Solving 32 + x = 33.241540277 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-32' to each side of the equation. 32 + -32 + x = 33.241540277 + -32 Combine like terms: 32 + -32 = 0 0 + x = 33.241540277 + -32 x = 33.241540277 + -32 Combine like terms: 33.241540277 + -32 = 1.241540277 x = 1.241540277 Simplifying x = 1.241540277

Subproblem 2

x + 32 = -33.241540277 Simplifying x + 32 = -33.241540277 Reorder the terms: 32 + x = -33.241540277 Solving 32 + x = -33.241540277 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-32' to each side of the equation. 32 + -32 + x = -33.241540277 + -32 Combine like terms: 32 + -32 = 0 0 + x = -33.241540277 + -32 x = -33.241540277 + -32 Combine like terms: -33.241540277 + -32 = -65.241540277 x = -65.241540277 Simplifying x = -65.241540277

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.241540277, -65.241540277}

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