0=.25x^2+x-16

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Solution for 0=.25x^2+x-16 equation:


Simplifying
0 = 0.25x2 + x + -16

Reorder the terms:
0 = -16 + x + 0.25x2

Solving
0 = -16 + x + 0.25x2

Solving for variable 'x'.

Combine like terms: 0 + 16 = 16
16 + -1x + -0.25x2 = -16 + x + 0.25x2 + 16 + -1x + -0.25x2

Reorder the terms:
16 + -1x + -0.25x2 = -16 + 16 + x + -1x + 0.25x2 + -0.25x2

Combine like terms: -16 + 16 = 0
16 + -1x + -0.25x2 = 0 + x + -1x + 0.25x2 + -0.25x2
16 + -1x + -0.25x2 = x + -1x + 0.25x2 + -0.25x2

Combine like terms: x + -1x = 0
16 + -1x + -0.25x2 = 0 + 0.25x2 + -0.25x2
16 + -1x + -0.25x2 = 0.25x2 + -0.25x2

Combine like terms: 0.25x2 + -0.25x2 = 0.00
16 + -1x + -0.25x2 = 0.00

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

Divide each side by '-0.25'.
-64 + 4x + x2 = 0

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + 4x + 64 + x2 = 0 + 64

Reorder the terms:
-64 + 64 + 4x + x2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + 4x + x2 = 0 + 64
4x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
4x + x2 = 64

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 = 64 + 4

Reorder the terms:
4 + 4x + x2 = 64 + 4

Combine like terms: 64 + 4 = 68
4 + 4x + x2 = 68

Factor a perfect square on the left side:
(x + 2)(x + 2) = 68

Calculate the square root of the right side: 8.246211251

Break this problem into two subproblems by setting 
(x + 2) equal to 8.246211251 and -8.246211251.

Subproblem 1

x + 2 = 8.246211251 Simplifying x + 2 = 8.246211251 Reorder the terms: 2 + x = 8.246211251 Solving 2 + x = 8.246211251 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 = 8.246211251 + -2 Combine like terms: 2 + -2 = 0 0 + x = 8.246211251 + -2 x = 8.246211251 + -2 Combine like terms: 8.246211251 + -2 = 6.246211251 x = 6.246211251 Simplifying x = 6.246211251

Subproblem 2

x + 2 = -8.246211251 Simplifying x + 2 = -8.246211251 Reorder the terms: 2 + x = -8.246211251 Solving 2 + x = -8.246211251 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 = -8.246211251 + -2 Combine like terms: 2 + -2 = 0 0 + x = -8.246211251 + -2 x = -8.246211251 + -2 Combine like terms: -8.246211251 + -2 = -10.246211251 x = -10.246211251 Simplifying x = -10.246211251

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.246211251, -10.246211251}

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