250=1.3*x+.04*x^2

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Solution for 250=1.3*x+.04*x^2 equation:


Simplifying
250 = 1.3x + 0.04x2

Solving
250 = 1.3x + 0.04x2

Solving for variable 'x'.

Reorder the terms:
250 + -1.3x + -0.04x2 = 1.3x + -1.3x + 0.04x2 + -0.04x2

Combine like terms: 1.3x + -1.3x = 0.0
250 + -1.3x + -0.04x2 = 0.0 + 0.04x2 + -0.04x2
250 + -1.3x + -0.04x2 = 0.04x2 + -0.04x2

Combine like terms: 0.04x2 + -0.04x2 = 0.00
250 + -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'.
-6250 + 32.5x + x2 = 0

Move the constant term to the right:

Add '6250' to each side of the equation.
-6250 + 32.5x + 6250 + x2 = 0 + 6250

Reorder the terms:
-6250 + 6250 + 32.5x + x2 = 0 + 6250

Combine like terms: -6250 + 6250 = 0
0 + 32.5x + x2 = 0 + 6250
32.5x + x2 = 0 + 6250

Combine like terms: 0 + 6250 = 6250
32.5x + x2 = 6250

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 = 6250 + 264.0625

Reorder the terms:
264.0625 + 32.5x + x2 = 6250 + 264.0625

Combine like terms: 6250 + 264.0625 = 6514.0625
264.0625 + 32.5x + x2 = 6514.0625

Factor a perfect square on the left side:
(x + 16.25)(x + 16.25) = 6514.0625

Calculate the square root of the right side: 80.709742287

Break this problem into two subproblems by setting 
(x + 16.25) equal to 80.709742287 and -80.709742287.

Subproblem 1

x + 16.25 = 80.709742287 Simplifying x + 16.25 = 80.709742287 Reorder the terms: 16.25 + x = 80.709742287 Solving 16.25 + x = 80.709742287 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 = 80.709742287 + -16.25 Combine like terms: 16.25 + -16.25 = 0.00 0.00 + x = 80.709742287 + -16.25 x = 80.709742287 + -16.25 Combine like terms: 80.709742287 + -16.25 = 64.459742287 x = 64.459742287 Simplifying x = 64.459742287

Subproblem 2

x + 16.25 = -80.709742287 Simplifying x + 16.25 = -80.709742287 Reorder the terms: 16.25 + x = -80.709742287 Solving 16.25 + x = -80.709742287 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 = -80.709742287 + -16.25 Combine like terms: 16.25 + -16.25 = 0.00 0.00 + x = -80.709742287 + -16.25 x = -80.709742287 + -16.25 Combine like terms: -80.709742287 + -16.25 = -96.959742287 x = -96.959742287 Simplifying x = -96.959742287

Solution

The solution to the problem is based on the solutions from the subproblems. x = {64.459742287, -96.959742287}

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