0.25x^2-8x-45=0

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Solution for 0.25x^2-8x-45=0 equation:


Simplifying
0.25x2 + -8x + -45 = 0

Reorder the terms:
-45 + -8x + 0.25x2 = 0

Solving
-45 + -8x + 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'.
-180 + -32x + x2 = 0

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + -32x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + -32x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + -32x + x2 = 0 + 180
-32x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
-32x + x2 = 180

The x term is -32x.  Take half its coefficient (-16).
Square it (256) and add it to both sides.

Add '256' to each side of the equation.
-32x + 256 + x2 = 180 + 256

Reorder the terms:
256 + -32x + x2 = 180 + 256

Combine like terms: 180 + 256 = 436
256 + -32x + x2 = 436

Factor a perfect square on the left side:
(x + -16)(x + -16) = 436

Calculate the square root of the right side: 20.880613018

Break this problem into two subproblems by setting 
(x + -16) equal to 20.880613018 and -20.880613018.

Subproblem 1

x + -16 = 20.880613018 Simplifying x + -16 = 20.880613018 Reorder the terms: -16 + x = 20.880613018 Solving -16 + x = 20.880613018 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + x = 20.880613018 + 16 Combine like terms: -16 + 16 = 0 0 + x = 20.880613018 + 16 x = 20.880613018 + 16 Combine like terms: 20.880613018 + 16 = 36.880613018 x = 36.880613018 Simplifying x = 36.880613018

Subproblem 2

x + -16 = -20.880613018 Simplifying x + -16 = -20.880613018 Reorder the terms: -16 + x = -20.880613018 Solving -16 + x = -20.880613018 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + x = -20.880613018 + 16 Combine like terms: -16 + 16 = 0 0 + x = -20.880613018 + 16 x = -20.880613018 + 16 Combine like terms: -20.880613018 + 16 = -4.880613018 x = -4.880613018 Simplifying x = -4.880613018

Solution

The solution to the problem is based on the solutions from the subproblems. x = {36.880613018, -4.880613018}

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