40-3x+.12x^2=190

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Solution for 40-3x+.12x^2=190 equation:


Simplifying
40 + -3x + 0.12x2 = 190

Solving
40 + -3x + 0.12x2 = 190

Solving for variable 'x'.

Reorder the terms:
40 + -190 + -3x + 0.12x2 = 190 + -190

Combine like terms: 40 + -190 = -150
-150 + -3x + 0.12x2 = 190 + -190

Combine like terms: 190 + -190 = 0
-150 + -3x + 0.12x2 = 0

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

Divide each side by '0.12'.
-1250 + -25x + x2 = 0

Move the constant term to the right:

Add '1250' to each side of the equation.
-1250 + -25x + 1250 + x2 = 0 + 1250

Reorder the terms:
-1250 + 1250 + -25x + x2 = 0 + 1250

Combine like terms: -1250 + 1250 = 0
0 + -25x + x2 = 0 + 1250
-25x + x2 = 0 + 1250

Combine like terms: 0 + 1250 = 1250
-25x + x2 = 1250

The x term is -25x.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25x + 156.25 + x2 = 1250 + 156.25

Reorder the terms:
156.25 + -25x + x2 = 1250 + 156.25

Combine like terms: 1250 + 156.25 = 1406.25
156.25 + -25x + x2 = 1406.25

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 1406.25

Calculate the square root of the right side: 37.5

Break this problem into two subproblems by setting 
(x + -12.5) equal to 37.5 and -37.5.

Subproblem 1

x + -12.5 = 37.5 Simplifying x + -12.5 = 37.5 Reorder the terms: -12.5 + x = 37.5 Solving -12.5 + x = 37.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + x = 37.5 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = 37.5 + 12.5 x = 37.5 + 12.5 Combine like terms: 37.5 + 12.5 = 50 x = 50 Simplifying x = 50

Subproblem 2

x + -12.5 = -37.5 Simplifying x + -12.5 = -37.5 Reorder the terms: -12.5 + x = -37.5 Solving -12.5 + x = -37.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + x = -37.5 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = -37.5 + 12.5 x = -37.5 + 12.5 Combine like terms: -37.5 + 12.5 = -25 x = -25 Simplifying x = -25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {50, -25}

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