0=0.02x^2+x-100

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Solution for 0=0.02x^2+x-100 equation:


Simplifying
0 = 0.02x2 + x + -100

Reorder the terms:
0 = -100 + x + 0.02x2

Solving
0 = -100 + x + 0.02x2

Solving for variable 'x'.

Combine like terms: 0 + 100 = 100
100 + -1x + -0.02x2 = -100 + x + 0.02x2 + 100 + -1x + -0.02x2

Reorder the terms:
100 + -1x + -0.02x2 = -100 + 100 + x + -1x + 0.02x2 + -0.02x2

Combine like terms: -100 + 100 = 0
100 + -1x + -0.02x2 = 0 + x + -1x + 0.02x2 + -0.02x2
100 + -1x + -0.02x2 = x + -1x + 0.02x2 + -0.02x2

Combine like terms: x + -1x = 0
100 + -1x + -0.02x2 = 0 + 0.02x2 + -0.02x2
100 + -1x + -0.02x2 = 0.02x2 + -0.02x2

Combine like terms: 0.02x2 + -0.02x2 = 0.00
100 + -1x + -0.02x2 = 0.00

Begin completing the square.  Divide all terms by
-0.02 the coefficient of the squared term: 

Divide each side by '-0.02'.
-5000 + 50x + x2 = 0

Move the constant term to the right:

Add '5000' to each side of the equation.
-5000 + 50x + 5000 + x2 = 0 + 5000

Reorder the terms:
-5000 + 5000 + 50x + x2 = 0 + 5000

Combine like terms: -5000 + 5000 = 0
0 + 50x + x2 = 0 + 5000
50x + x2 = 0 + 5000

Combine like terms: 0 + 5000 = 5000
50x + x2 = 5000

The x term is 50x.  Take half its coefficient (25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
50x + 625 + x2 = 5000 + 625

Reorder the terms:
625 + 50x + x2 = 5000 + 625

Combine like terms: 5000 + 625 = 5625
625 + 50x + x2 = 5625

Factor a perfect square on the left side:
(x + 25)(x + 25) = 5625

Calculate the square root of the right side: 75

Break this problem into two subproblems by setting 
(x + 25) equal to 75 and -75.

Subproblem 1

x + 25 = 75 Simplifying x + 25 = 75 Reorder the terms: 25 + x = 75 Solving 25 + x = 75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + x = 75 + -25 Combine like terms: 25 + -25 = 0 0 + x = 75 + -25 x = 75 + -25 Combine like terms: 75 + -25 = 50 x = 50 Simplifying x = 50

Subproblem 2

x + 25 = -75 Simplifying x + 25 = -75 Reorder the terms: 25 + x = -75 Solving 25 + x = -75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + x = -75 + -25 Combine like terms: 25 + -25 = 0 0 + x = -75 + -25 x = -75 + -25 Combine like terms: -75 + -25 = -100 x = -100 Simplifying x = -100

Solution

The solution to the problem is based on the solutions from the subproblems. x = {50, -100}

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