0.125x^2-x-16=0

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Solution for 0.125x^2-x-16=0 equation:


Simplifying
0.125x2 + -1x + -16 = 0

Reorder the terms:
-16 + -1x + 0.125x2 = 0

Solving
-16 + -1x + 0.125x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.125'.
-128 + -8x + x2 = 0

Move the constant term to the right:

Add '128' to each side of the equation.
-128 + -8x + 128 + x2 = 0 + 128

Reorder the terms:
-128 + 128 + -8x + x2 = 0 + 128

Combine like terms: -128 + 128 = 0
0 + -8x + x2 = 0 + 128
-8x + x2 = 0 + 128

Combine like terms: 0 + 128 = 128
-8x + x2 = 128

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 128 + 16

Reorder the terms:
16 + -8x + x2 = 128 + 16

Combine like terms: 128 + 16 = 144
16 + -8x + x2 = 144

Factor a perfect square on the left side:
(x + -4)(x + -4) = 144

Calculate the square root of the right side: 12

Break this problem into two subproblems by setting 
(x + -4) equal to 12 and -12.

Subproblem 1

x + -4 = 12 Simplifying x + -4 = 12 Reorder the terms: -4 + x = 12 Solving -4 + x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 12 + 4 Combine like terms: -4 + 4 = 0 0 + x = 12 + 4 x = 12 + 4 Combine like terms: 12 + 4 = 16 x = 16 Simplifying x = 16

Subproblem 2

x + -4 = -12 Simplifying x + -4 = -12 Reorder the terms: -4 + x = -12 Solving -4 + x = -12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -12 + 4 Combine like terms: -4 + 4 = 0 0 + x = -12 + 4 x = -12 + 4 Combine like terms: -12 + 4 = -8 x = -8 Simplifying x = -8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16, -8}

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