0.25x^2-x-17=0

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Solution for 0.25x^2-x-17=0 equation:


Simplifying
0.25x2 + -1x + -17 = 0

Reorder the terms:
-17 + -1x + 0.25x2 = 0

Solving
-17 + -1x + 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'.
-68 + -4x + x2 = 0

Move the constant term to the right:

Add '68' to each side of the equation.
-68 + -4x + 68 + x2 = 0 + 68

Reorder the terms:
-68 + 68 + -4x + x2 = 0 + 68

Combine like terms: -68 + 68 = 0
0 + -4x + x2 = 0 + 68
-4x + x2 = 0 + 68

Combine like terms: 0 + 68 = 68
-4x + x2 = 68

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 68 + 4

Reorder the terms:
4 + -4x + x2 = 68 + 4

Combine like terms: 68 + 4 = 72
4 + -4x + x2 = 72

Factor a perfect square on the left side:
(x + -2)(x + -2) = 72

Calculate the square root of the right side: 8.485281374

Break this problem into two subproblems by setting 
(x + -2) equal to 8.485281374 and -8.485281374.

Subproblem 1

x + -2 = 8.485281374 Simplifying x + -2 = 8.485281374 Reorder the terms: -2 + x = 8.485281374 Solving -2 + x = 8.485281374 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 8.485281374 + 2 Combine like terms: -2 + 2 = 0 0 + x = 8.485281374 + 2 x = 8.485281374 + 2 Combine like terms: 8.485281374 + 2 = 10.485281374 x = 10.485281374 Simplifying x = 10.485281374

Subproblem 2

x + -2 = -8.485281374 Simplifying x + -2 = -8.485281374 Reorder the terms: -2 + x = -8.485281374 Solving -2 + x = -8.485281374 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -8.485281374 + 2 Combine like terms: -2 + 2 = 0 0 + x = -8.485281374 + 2 x = -8.485281374 + 2 Combine like terms: -8.485281374 + 2 = -6.485281374 x = -6.485281374 Simplifying x = -6.485281374

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.485281374, -6.485281374}

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