200=1.3x+0.04x^2

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Solution for 200=1.3x+0.04x^2 equation:


Simplifying
200 = 1.3x + 0.04x2

Solving
200 = 1.3x + 0.04x2

Solving for variable 'x'.

Reorder the terms:
200 + -1.3x + -0.04x2 = 1.3x + -1.3x + 0.04x2 + -0.04x2

Combine like terms: 1.3x + -1.3x = 0.0
200 + -1.3x + -0.04x2 = 0.0 + 0.04x2 + -0.04x2
200 + -1.3x + -0.04x2 = 0.04x2 + -0.04x2

Combine like terms: 0.04x2 + -0.04x2 = 0.00
200 + -1.3x + -0.04x2 = 0.00

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
-5000 + 32.5x + x2 = 0

Move the constant term to the right:

Add '5000' to each side of the equation.
-5000 + 32.5x + 5000 + x2 = 0 + 5000

Reorder the terms:
-5000 + 5000 + 32.5x + x2 = 0 + 5000

Combine like terms: -5000 + 5000 = 0
0 + 32.5x + x2 = 0 + 5000
32.5x + x2 = 0 + 5000

Combine like terms: 0 + 5000 = 5000
32.5x + x2 = 5000

The x term is 32.5x.  Take half its coefficient (16.25).
Square it (264.0625) and add it to both sides.

Add '264.0625' to each side of the equation.
32.5x + 264.0625 + x2 = 5000 + 264.0625

Reorder the terms:
264.0625 + 32.5x + x2 = 5000 + 264.0625

Combine like terms: 5000 + 264.0625 = 5264.0625
264.0625 + 32.5x + x2 = 5264.0625

Factor a perfect square on the left side:
(x + 16.25)(x + 16.25) = 5264.0625

Calculate the square root of the right side: 72.553859305

Break this problem into two subproblems by setting 
(x + 16.25) equal to 72.553859305 and -72.553859305.

Subproblem 1

x + 16.25 = 72.553859305 Simplifying x + 16.25 = 72.553859305 Reorder the terms: 16.25 + x = 72.553859305 Solving 16.25 + x = 72.553859305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16.25' to each side of the equation. 16.25 + -16.25 + x = 72.553859305 + -16.25 Combine like terms: 16.25 + -16.25 = 0.00 0.00 + x = 72.553859305 + -16.25 x = 72.553859305 + -16.25 Combine like terms: 72.553859305 + -16.25 = 56.303859305 x = 56.303859305 Simplifying x = 56.303859305

Subproblem 2

x + 16.25 = -72.553859305 Simplifying x + 16.25 = -72.553859305 Reorder the terms: 16.25 + x = -72.553859305 Solving 16.25 + x = -72.553859305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16.25' to each side of the equation. 16.25 + -16.25 + x = -72.553859305 + -16.25 Combine like terms: 16.25 + -16.25 = 0.00 0.00 + x = -72.553859305 + -16.25 x = -72.553859305 + -16.25 Combine like terms: -72.553859305 + -16.25 = -88.803859305 x = -88.803859305 Simplifying x = -88.803859305

Solution

The solution to the problem is based on the solutions from the subproblems. x = {56.303859305, -88.803859305}

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