0.25x^2-9x+1=0

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Solution for 0.25x^2-9x+1=0 equation:


Simplifying
0.25x2 + -9x + 1 = 0

Reorder the terms:
1 + -9x + 0.25x2 = 0

Solving
1 + -9x + 0.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.25'.
4 + -36x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -36x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + -36x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -36x + x2 = 0 + -4
-36x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
-36x + x2 = -4

The x term is -36x.  Take half its coefficient (-18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
-36x + 324 + x2 = -4 + 324

Reorder the terms:
324 + -36x + x2 = -4 + 324

Combine like terms: -4 + 324 = 320
324 + -36x + x2 = 320

Factor a perfect square on the left side:
(x + -18)(x + -18) = 320

Calculate the square root of the right side: 17.88854382

Break this problem into two subproblems by setting 
(x + -18) equal to 17.88854382 and -17.88854382.

Subproblem 1

x + -18 = 17.88854382 Simplifying x + -18 = 17.88854382 Reorder the terms: -18 + x = 17.88854382 Solving -18 + x = 17.88854382 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x = 17.88854382 + 18 Combine like terms: -18 + 18 = 0 0 + x = 17.88854382 + 18 x = 17.88854382 + 18 Combine like terms: 17.88854382 + 18 = 35.88854382 x = 35.88854382 Simplifying x = 35.88854382

Subproblem 2

x + -18 = -17.88854382 Simplifying x + -18 = -17.88854382 Reorder the terms: -18 + x = -17.88854382 Solving -18 + x = -17.88854382 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x = -17.88854382 + 18 Combine like terms: -18 + 18 = 0 0 + x = -17.88854382 + 18 x = -17.88854382 + 18 Combine like terms: -17.88854382 + 18 = 0.11145618 x = 0.11145618 Simplifying x = 0.11145618

Solution

The solution to the problem is based on the solutions from the subproblems. x = {35.88854382, 0.11145618}

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