0.5x^2-3x-9.40=0

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Solution for 0.5x^2-3x-9.40=0 equation:


Simplifying
0.5x2 + -3x + -9.40 = 0

Reorder the terms:
-9.40 + -3x + 0.5x2 = 0

Solving
-9.40 + -3x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-18.8 + -6x + x2 = 0

Move the constant term to the right:

Add '18.8' to each side of the equation.
-18.8 + -6x + 18.8 + x2 = 0 + 18.8

Reorder the terms:
-18.8 + 18.8 + -6x + x2 = 0 + 18.8

Combine like terms: -18.8 + 18.8 = 0.0
0.0 + -6x + x2 = 0 + 18.8
-6x + x2 = 0 + 18.8

Combine like terms: 0 + 18.8 = 18.8
-6x + x2 = 18.8

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 = 18.8 + 9

Reorder the terms:
9 + -6x + x2 = 18.8 + 9

Combine like terms: 18.8 + 9 = 27.8
9 + -6x + x2 = 27.8

Factor a perfect square on the left side:
(x + -3)(x + -3) = 27.8

Calculate the square root of the right side: 5.272570531

Break this problem into two subproblems by setting 
(x + -3) equal to 5.272570531 and -5.272570531.

Subproblem 1

x + -3 = 5.272570531 Simplifying x + -3 = 5.272570531 Reorder the terms: -3 + x = 5.272570531 Solving -3 + x = 5.272570531 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 = 5.272570531 + 3 Combine like terms: -3 + 3 = 0 0 + x = 5.272570531 + 3 x = 5.272570531 + 3 Combine like terms: 5.272570531 + 3 = 8.272570531 x = 8.272570531 Simplifying x = 8.272570531

Subproblem 2

x + -3 = -5.272570531 Simplifying x + -3 = -5.272570531 Reorder the terms: -3 + x = -5.272570531 Solving -3 + x = -5.272570531 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 = -5.272570531 + 3 Combine like terms: -3 + 3 = 0 0 + x = -5.272570531 + 3 x = -5.272570531 + 3 Combine like terms: -5.272570531 + 3 = -2.272570531 x = -2.272570531 Simplifying x = -2.272570531

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.272570531, -2.272570531}

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