.25x^2-20x=15

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Solution for .25x^2-20x=15 equation:


Simplifying
0.25x2 + -20x = 15

Reorder the terms:
-20x + 0.25x2 = 15

Solving
-20x + 0.25x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -20x + 0.25x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -20x + 0.25x2 = 0

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

Divide each side by '0.25'.
-60 + -80x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + -80x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + -80x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + -80x + x2 = 0 + 60
-80x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
-80x + x2 = 60

The x term is -80x.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80x + 1600 + x2 = 60 + 1600

Reorder the terms:
1600 + -80x + x2 = 60 + 1600

Combine like terms: 60 + 1600 = 1660
1600 + -80x + x2 = 1660

Factor a perfect square on the left side:
(x + -40)(x + -40) = 1660

Calculate the square root of the right side: 40.743097575

Break this problem into two subproblems by setting 
(x + -40) equal to 40.743097575 and -40.743097575.

Subproblem 1

x + -40 = 40.743097575 Simplifying x + -40 = 40.743097575 Reorder the terms: -40 + x = 40.743097575 Solving -40 + x = 40.743097575 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 40.743097575 + 40 Combine like terms: -40 + 40 = 0 0 + x = 40.743097575 + 40 x = 40.743097575 + 40 Combine like terms: 40.743097575 + 40 = 80.743097575 x = 80.743097575 Simplifying x = 80.743097575

Subproblem 2

x + -40 = -40.743097575 Simplifying x + -40 = -40.743097575 Reorder the terms: -40 + x = -40.743097575 Solving -40 + x = -40.743097575 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -40.743097575 + 40 Combine like terms: -40 + 40 = 0 0 + x = -40.743097575 + 40 x = -40.743097575 + 40 Combine like terms: -40.743097575 + 40 = -0.743097575 x = -0.743097575 Simplifying x = -0.743097575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {80.743097575, -0.743097575}

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