65x-x^2-800=0

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Solution for 65x-x^2-800=0 equation:


Simplifying
65x + -1x2 + -800 = 0

Reorder the terms:
-800 + 65x + -1x2 = 0

Solving
-800 + 65x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
800 + -65x + x2 = 0

Move the constant term to the right:

Add '-800' to each side of the equation.
800 + -65x + -800 + x2 = 0 + -800

Reorder the terms:
800 + -800 + -65x + x2 = 0 + -800

Combine like terms: 800 + -800 = 0
0 + -65x + x2 = 0 + -800
-65x + x2 = 0 + -800

Combine like terms: 0 + -800 = -800
-65x + x2 = -800

The x term is -65x.  Take half its coefficient (-32.5).
Square it (1056.25) and add it to both sides.

Add '1056.25' to each side of the equation.
-65x + 1056.25 + x2 = -800 + 1056.25

Reorder the terms:
1056.25 + -65x + x2 = -800 + 1056.25

Combine like terms: -800 + 1056.25 = 256.25
1056.25 + -65x + x2 = 256.25

Factor a perfect square on the left side:
(x + -32.5)(x + -32.5) = 256.25

Calculate the square root of the right side: 16.007810594

Break this problem into two subproblems by setting 
(x + -32.5) equal to 16.007810594 and -16.007810594.

Subproblem 1

x + -32.5 = 16.007810594 Simplifying x + -32.5 = 16.007810594 Reorder the terms: -32.5 + x = 16.007810594 Solving -32.5 + x = 16.007810594 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '32.5' to each side of the equation. -32.5 + 32.5 + x = 16.007810594 + 32.5 Combine like terms: -32.5 + 32.5 = 0.0 0.0 + x = 16.007810594 + 32.5 x = 16.007810594 + 32.5 Combine like terms: 16.007810594 + 32.5 = 48.507810594 x = 48.507810594 Simplifying x = 48.507810594

Subproblem 2

x + -32.5 = -16.007810594 Simplifying x + -32.5 = -16.007810594 Reorder the terms: -32.5 + x = -16.007810594 Solving -32.5 + x = -16.007810594 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '32.5' to each side of the equation. -32.5 + 32.5 + x = -16.007810594 + 32.5 Combine like terms: -32.5 + 32.5 = 0.0 0.0 + x = -16.007810594 + 32.5 x = -16.007810594 + 32.5 Combine like terms: -16.007810594 + 32.5 = 16.492189406 x = 16.492189406 Simplifying x = 16.492189406

Solution

The solution to the problem is based on the solutions from the subproblems. x = {48.507810594, 16.492189406}

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