-0.5x^2+3x+4=-4

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Solution for -0.5x^2+3x+4=-4 equation:


Simplifying
-0.5x2 + 3x + 4 = -4

Reorder the terms:
4 + 3x + -0.5x2 = -4

Solving
4 + 3x + -0.5x2 = -4

Solving for variable 'x'.

Reorder the terms:
4 + 4 + 3x + -0.5x2 = -4 + 4

Combine like terms: 4 + 4 = 8
8 + 3x + -0.5x2 = -4 + 4

Combine like terms: -4 + 4 = 0
8 + 3x + -0.5x2 = 0

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

Divide each side by '-0.5'.
-16 + -6x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -6x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -6x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -6x + x2 = 0 + 16
-6x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-6x + x2 = 16

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 16 + 9

Reorder the terms:
9 + -6x + x2 = 16 + 9

Combine like terms: 16 + 9 = 25
9 + -6x + x2 = 25

Factor a perfect square on the left side:
(x + -3)(x + -3) = 25

Calculate the square root of the right side: 5

Break this problem into two subproblems by setting 
(x + -3) equal to 5 and -5.

Subproblem 1

x + -3 = 5 Simplifying x + -3 = 5 Reorder the terms: -3 + x = 5 Solving -3 + x = 5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 5 + 3 Combine like terms: -3 + 3 = 0 0 + x = 5 + 3 x = 5 + 3 Combine like terms: 5 + 3 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + -3 = -5 Simplifying x + -3 = -5 Reorder the terms: -3 + x = -5 Solving -3 + x = -5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -5 + 3 Combine like terms: -3 + 3 = 0 0 + x = -5 + 3 x = -5 + 3 Combine like terms: -5 + 3 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -2}

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