0=.25x^2+x-3

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Solution for 0=.25x^2+x-3 equation:


Simplifying
0 = 0.25x2 + x + -3

Reorder the terms:
0 = -3 + x + 0.25x2

Solving
0 = -3 + x + 0.25x2

Solving for variable 'x'.

Combine like terms: 0 + 3 = 3
3 + -1x + -0.25x2 = -3 + x + 0.25x2 + 3 + -1x + -0.25x2

Reorder the terms:
3 + -1x + -0.25x2 = -3 + 3 + x + -1x + 0.25x2 + -0.25x2

Combine like terms: -3 + 3 = 0
3 + -1x + -0.25x2 = 0 + x + -1x + 0.25x2 + -0.25x2
3 + -1x + -0.25x2 = x + -1x + 0.25x2 + -0.25x2

Combine like terms: x + -1x = 0
3 + -1x + -0.25x2 = 0 + 0.25x2 + -0.25x2
3 + -1x + -0.25x2 = 0.25x2 + -0.25x2

Combine like terms: 0.25x2 + -0.25x2 = 0.00
3 + -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'.
-12 + 4x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 4x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 4x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 4x + x2 = 0 + 12
4x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
4x + x2 = 12

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 = 12 + 4

Reorder the terms:
4 + 4x + x2 = 12 + 4

Combine like terms: 12 + 4 = 16
4 + 4x + x2 = 16

Factor a perfect square on the left side:
(x + 2)(x + 2) = 16

Calculate the square root of the right side: 4

Break this problem into two subproblems by setting 
(x + 2) equal to 4 and -4.

Subproblem 1

x + 2 = 4 Simplifying x + 2 = 4 Reorder the terms: 2 + x = 4 Solving 2 + x = 4 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 = 4 + -2 Combine like terms: 2 + -2 = 0 0 + x = 4 + -2 x = 4 + -2 Combine like terms: 4 + -2 = 2 x = 2 Simplifying x = 2

Subproblem 2

x + 2 = -4 Simplifying x + 2 = -4 Reorder the terms: 2 + x = -4 Solving 2 + x = -4 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 = -4 + -2 Combine like terms: 2 + -2 = 0 0 + x = -4 + -2 x = -4 + -2 Combine like terms: -4 + -2 = -6 x = -6 Simplifying x = -6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2, -6}

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