-.2x^2+39x=170

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Solution for -.2x^2+39x=170 equation:


Simplifying
-0.2x2 + 39x = 170

Reorder the terms:
39x + -0.2x2 = 170

Solving
39x + -0.2x2 = 170

Solving for variable 'x'.

Reorder the terms:
-170 + 39x + -0.2x2 = 170 + -170

Combine like terms: 170 + -170 = 0
-170 + 39x + -0.2x2 = 0

Begin completing the square.  Divide all terms by
-0.2 the coefficient of the squared term: 

Divide each side by '-0.2'.
850 + -195x + x2 = 0

Move the constant term to the right:

Add '-850' to each side of the equation.
850 + -195x + -850 + x2 = 0 + -850

Reorder the terms:
850 + -850 + -195x + x2 = 0 + -850

Combine like terms: 850 + -850 = 0
0 + -195x + x2 = 0 + -850
-195x + x2 = 0 + -850

Combine like terms: 0 + -850 = -850
-195x + x2 = -850

The x term is -195x.  Take half its coefficient (-97.5).
Square it (9506.25) and add it to both sides.

Add '9506.25' to each side of the equation.
-195x + 9506.25 + x2 = -850 + 9506.25

Reorder the terms:
9506.25 + -195x + x2 = -850 + 9506.25

Combine like terms: -850 + 9506.25 = 8656.25
9506.25 + -195x + x2 = 8656.25

Factor a perfect square on the left side:
(x + -97.5)(x + -97.5) = 8656.25

Calculate the square root of the right side: 93.03897033

Break this problem into two subproblems by setting 
(x + -97.5) equal to 93.03897033 and -93.03897033.

Subproblem 1

x + -97.5 = 93.03897033 Simplifying x + -97.5 = 93.03897033 Reorder the terms: -97.5 + x = 93.03897033 Solving -97.5 + x = 93.03897033 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '97.5' to each side of the equation. -97.5 + 97.5 + x = 93.03897033 + 97.5 Combine like terms: -97.5 + 97.5 = 0.0 0.0 + x = 93.03897033 + 97.5 x = 93.03897033 + 97.5 Combine like terms: 93.03897033 + 97.5 = 190.53897033 x = 190.53897033 Simplifying x = 190.53897033

Subproblem 2

x + -97.5 = -93.03897033 Simplifying x + -97.5 = -93.03897033 Reorder the terms: -97.5 + x = -93.03897033 Solving -97.5 + x = -93.03897033 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '97.5' to each side of the equation. -97.5 + 97.5 + x = -93.03897033 + 97.5 Combine like terms: -97.5 + 97.5 = 0.0 0.0 + x = -93.03897033 + 97.5 x = -93.03897033 + 97.5 Combine like terms: -93.03897033 + 97.5 = 4.46102967 x = 4.46102967 Simplifying x = 4.46102967

Solution

The solution to the problem is based on the solutions from the subproblems. x = {190.53897033, 4.46102967}

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