800b-b^2=1000

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Solution for 800b-b^2=1000 equation:


Simplifying
800b + -1b2 = 1000

Solving
800b + -1b2 = 1000

Solving for variable 'b'.

Reorder the terms:
-1000 + 800b + -1b2 = 1000 + -1000

Combine like terms: 1000 + -1000 = 0
-1000 + 800b + -1b2 = 0

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

Divide each side by '-1'.
1000 + -800b + b2 = 0

Move the constant term to the right:

Add '-1000' to each side of the equation.
1000 + -800b + -1000 + b2 = 0 + -1000

Reorder the terms:
1000 + -1000 + -800b + b2 = 0 + -1000

Combine like terms: 1000 + -1000 = 0
0 + -800b + b2 = 0 + -1000
-800b + b2 = 0 + -1000

Combine like terms: 0 + -1000 = -1000
-800b + b2 = -1000

The b term is -800b.  Take half its coefficient (-400).
Square it (160000) and add it to both sides.

Add '160000' to each side of the equation.
-800b + 160000 + b2 = -1000 + 160000

Reorder the terms:
160000 + -800b + b2 = -1000 + 160000

Combine like terms: -1000 + 160000 = 159000
160000 + -800b + b2 = 159000

Factor a perfect square on the left side:
(b + -400)(b + -400) = 159000

Calculate the square root of the right side: 398.748040748

Break this problem into two subproblems by setting 
(b + -400) equal to 398.748040748 and -398.748040748.

Subproblem 1

b + -400 = 398.748040748 Simplifying b + -400 = 398.748040748 Reorder the terms: -400 + b = 398.748040748 Solving -400 + b = 398.748040748 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '400' to each side of the equation. -400 + 400 + b = 398.748040748 + 400 Combine like terms: -400 + 400 = 0 0 + b = 398.748040748 + 400 b = 398.748040748 + 400 Combine like terms: 398.748040748 + 400 = 798.748040748 b = 798.748040748 Simplifying b = 798.748040748

Subproblem 2

b + -400 = -398.748040748 Simplifying b + -400 = -398.748040748 Reorder the terms: -400 + b = -398.748040748 Solving -400 + b = -398.748040748 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '400' to each side of the equation. -400 + 400 + b = -398.748040748 + 400 Combine like terms: -400 + 400 = 0 0 + b = -398.748040748 + 400 b = -398.748040748 + 400 Combine like terms: -398.748040748 + 400 = 1.251959252 b = 1.251959252 Simplifying b = 1.251959252

Solution

The solution to the problem is based on the solutions from the subproblems. b = {798.748040748, 1.251959252}

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