800-45x+.10x^2=0

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Solution for 800-45x+.10x^2=0 equation:


Simplifying
800 + -45x + 0.10x2 = 0

Solving
800 + -45x + 0.10x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.10'.
8000 + -450x + x2 = 0

Move the constant term to the right:

Add '-8000' to each side of the equation.
8000 + -450x + -8000 + x2 = 0 + -8000

Reorder the terms:
8000 + -8000 + -450x + x2 = 0 + -8000

Combine like terms: 8000 + -8000 = 0
0 + -450x + x2 = 0 + -8000
-450x + x2 = 0 + -8000

Combine like terms: 0 + -8000 = -8000
-450x + x2 = -8000

The x term is -450x.  Take half its coefficient (-225).
Square it (50625) and add it to both sides.

Add '50625' to each side of the equation.
-450x + 50625 + x2 = -8000 + 50625

Reorder the terms:
50625 + -450x + x2 = -8000 + 50625

Combine like terms: -8000 + 50625 = 42625
50625 + -450x + x2 = 42625

Factor a perfect square on the left side:
(x + -225)(x + -225) = 42625

Calculate the square root of the right side: 206.458228221

Break this problem into two subproblems by setting 
(x + -225) equal to 206.458228221 and -206.458228221.

Subproblem 1

x + -225 = 206.458228221 Simplifying x + -225 = 206.458228221 Reorder the terms: -225 + x = 206.458228221 Solving -225 + x = 206.458228221 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '225' to each side of the equation. -225 + 225 + x = 206.458228221 + 225 Combine like terms: -225 + 225 = 0 0 + x = 206.458228221 + 225 x = 206.458228221 + 225 Combine like terms: 206.458228221 + 225 = 431.458228221 x = 431.458228221 Simplifying x = 431.458228221

Subproblem 2

x + -225 = -206.458228221 Simplifying x + -225 = -206.458228221 Reorder the terms: -225 + x = -206.458228221 Solving -225 + x = -206.458228221 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '225' to each side of the equation. -225 + 225 + x = -206.458228221 + 225 Combine like terms: -225 + 225 = 0 0 + x = -206.458228221 + 225 x = -206.458228221 + 225 Combine like terms: -206.458228221 + 225 = 18.541771779 x = 18.541771779 Simplifying x = 18.541771779

Solution

The solution to the problem is based on the solutions from the subproblems. x = {431.458228221, 18.541771779}

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