19175-112x=0.4x^2

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Solution for 19175-112x=0.4x^2 equation:


Simplifying
19175 + -112x = 0.4x2

Solving
19175 + -112x = 0.4x2

Solving for variable 'x'.

Combine like terms: 0.4x2 + -0.4x2 = 0.0
19175 + -112x + -0.4x2 = 0.0

Begin completing the square.  Divide all terms by
-0.4 the coefficient of the squared term: 

Divide each side by '-0.4'.
-47937.5 + 280x + x2 = 0

Move the constant term to the right:

Add '47937.5' to each side of the equation.
-47937.5 + 280x + 47937.5 + x2 = 0 + 47937.5

Reorder the terms:
-47937.5 + 47937.5 + 280x + x2 = 0 + 47937.5

Combine like terms: -47937.5 + 47937.5 = 0.0
0.0 + 280x + x2 = 0 + 47937.5
280x + x2 = 0 + 47937.5

Combine like terms: 0 + 47937.5 = 47937.5
280x + x2 = 47937.5

The x term is 280x.  Take half its coefficient (140).
Square it (19600) and add it to both sides.

Add '19600' to each side of the equation.
280x + 19600 + x2 = 47937.5 + 19600

Reorder the terms:
19600 + 280x + x2 = 47937.5 + 19600

Combine like terms: 47937.5 + 19600 = 67537.5
19600 + 280x + x2 = 67537.5

Factor a perfect square on the left side:
(x + 140)(x + 140) = 67537.5

Calculate the square root of the right side: 259.879779898

Break this problem into two subproblems by setting 
(x + 140) equal to 259.879779898 and -259.879779898.

Subproblem 1

x + 140 = 259.879779898 Simplifying x + 140 = 259.879779898 Reorder the terms: 140 + x = 259.879779898 Solving 140 + x = 259.879779898 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-140' to each side of the equation. 140 + -140 + x = 259.879779898 + -140 Combine like terms: 140 + -140 = 0 0 + x = 259.879779898 + -140 x = 259.879779898 + -140 Combine like terms: 259.879779898 + -140 = 119.879779898 x = 119.879779898 Simplifying x = 119.879779898

Subproblem 2

x + 140 = -259.879779898 Simplifying x + 140 = -259.879779898 Reorder the terms: 140 + x = -259.879779898 Solving 140 + x = -259.879779898 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-140' to each side of the equation. 140 + -140 + x = -259.879779898 + -140 Combine like terms: 140 + -140 = 0 0 + x = -259.879779898 + -140 x = -259.879779898 + -140 Combine like terms: -259.879779898 + -140 = -399.879779898 x = -399.879779898 Simplifying x = -399.879779898

Solution

The solution to the problem is based on the solutions from the subproblems. x = {119.879779898, -399.879779898}

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