0=0.5x^2+3.5x+6

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Solution for 0=0.5x^2+3.5x+6 equation:


Simplifying
0 = 0.5x2 + 3.5x + 6

Reorder the terms:
0 = 6 + 3.5x + 0.5x2

Solving
0 = 6 + 3.5x + 0.5x2

Solving for variable 'x'.

Combine like terms: 0 + -6 = -6
-6 + -3.5x + -0.5x2 = 6 + 3.5x + 0.5x2 + -6 + -3.5x + -0.5x2

Reorder the terms:
-6 + -3.5x + -0.5x2 = 6 + -6 + 3.5x + -3.5x + 0.5x2 + -0.5x2

Combine like terms: 6 + -6 = 0
-6 + -3.5x + -0.5x2 = 0 + 3.5x + -3.5x + 0.5x2 + -0.5x2
-6 + -3.5x + -0.5x2 = 3.5x + -3.5x + 0.5x2 + -0.5x2

Combine like terms: 3.5x + -3.5x = 0.0
-6 + -3.5x + -0.5x2 = 0.0 + 0.5x2 + -0.5x2
-6 + -3.5x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
-6 + -3.5x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
12 + 7x + x2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + 7x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + 7x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 7x + x2 = 0 + -12
7x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
7x + x2 = -12

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = -12 + 12.25

Reorder the terms:
12.25 + 7x + x2 = -12 + 12.25

Combine like terms: -12 + 12.25 = 0.25
12.25 + 7x + x2 = 0.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 0.25

Calculate the square root of the right side: 0.5

Break this problem into two subproblems by setting 
(x + 3.5) equal to 0.5 and -0.5.

Subproblem 1

x + 3.5 = 0.5 Simplifying x + 3.5 = 0.5 Reorder the terms: 3.5 + x = 0.5 Solving 3.5 + x = 0.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 0.5 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 0.5 + -3.5 x = 0.5 + -3.5 Combine like terms: 0.5 + -3.5 = -3 x = -3 Simplifying x = -3

Subproblem 2

x + 3.5 = -0.5 Simplifying x + 3.5 = -0.5 Reorder the terms: 3.5 + x = -0.5 Solving 3.5 + x = -0.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -0.5 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -0.5 + -3.5 x = -0.5 + -3.5 Combine like terms: -0.5 + -3.5 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3, -4}

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