=.002x^2+.3x-50

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Solution for =.002x^2+.3x-50 equation:


Simplifying
0 = 0.002x2 + 0.3x + -50

Reorder the terms:
0 = -50 + 0.3x + 0.002x2

Solving
0 = -50 + 0.3x + 0.002x2

Solving for variable 'x'.

Combine like terms: 0 + 50 = 50
50 + -0.3x + -0.002x2 = -50 + 0.3x + 0.002x2 + 50 + -0.3x + -0.002x2

Reorder the terms:
50 + -0.3x + -0.002x2 = -50 + 50 + 0.3x + -0.3x + 0.002x2 + -0.002x2

Combine like terms: -50 + 50 = 0
50 + -0.3x + -0.002x2 = 0 + 0.3x + -0.3x + 0.002x2 + -0.002x2
50 + -0.3x + -0.002x2 = 0.3x + -0.3x + 0.002x2 + -0.002x2

Combine like terms: 0.3x + -0.3x = 0.0
50 + -0.3x + -0.002x2 = 0.0 + 0.002x2 + -0.002x2
50 + -0.3x + -0.002x2 = 0.002x2 + -0.002x2

Combine like terms: 0.002x2 + -0.002x2 = 0.000
50 + -0.3x + -0.002x2 = 0.000

Begin completing the square.  Divide all terms by
-0.002 the coefficient of the squared term: 

Divide each side by '-0.002'.
-25000 + 150x + x2 = 0

Move the constant term to the right:

Add '25000' to each side of the equation.
-25000 + 150x + 25000 + x2 = 0 + 25000

Reorder the terms:
-25000 + 25000 + 150x + x2 = 0 + 25000

Combine like terms: -25000 + 25000 = 0
0 + 150x + x2 = 0 + 25000
150x + x2 = 0 + 25000

Combine like terms: 0 + 25000 = 25000
150x + x2 = 25000

The x term is 150x.  Take half its coefficient (75).
Square it (5625) and add it to both sides.

Add '5625' to each side of the equation.
150x + 5625 + x2 = 25000 + 5625

Reorder the terms:
5625 + 150x + x2 = 25000 + 5625

Combine like terms: 25000 + 5625 = 30625
5625 + 150x + x2 = 30625

Factor a perfect square on the left side:
(x + 75)(x + 75) = 30625

Calculate the square root of the right side: 175

Break this problem into two subproblems by setting 
(x + 75) equal to 175 and -175.

Subproblem 1

x + 75 = 175 Simplifying x + 75 = 175 Reorder the terms: 75 + x = 175 Solving 75 + x = 175 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-75' to each side of the equation. 75 + -75 + x = 175 + -75 Combine like terms: 75 + -75 = 0 0 + x = 175 + -75 x = 175 + -75 Combine like terms: 175 + -75 = 100 x = 100 Simplifying x = 100

Subproblem 2

x + 75 = -175 Simplifying x + 75 = -175 Reorder the terms: 75 + x = -175 Solving 75 + x = -175 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-75' to each side of the equation. 75 + -75 + x = -175 + -75 Combine like terms: 75 + -75 = 0 0 + x = -175 + -75 x = -175 + -75 Combine like terms: -175 + -75 = -250 x = -250 Simplifying x = -250

Solution

The solution to the problem is based on the solutions from the subproblems. x = {100, -250}

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