3+5x-0.5x^2=0

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Solution for 3+5x-0.5x^2=0 equation:


Simplifying
3 + 5x + -0.5x2 = 0

Solving
3 + 5x + -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'.
-6 + -10x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -10x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -10x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -10x + x2 = 0 + 6
-10x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-10x + x2 = 6

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 6 + 25

Reorder the terms:
25 + -10x + x2 = 6 + 25

Combine like terms: 6 + 25 = 31
25 + -10x + x2 = 31

Factor a perfect square on the left side:
(x + -5)(x + -5) = 31

Calculate the square root of the right side: 5.567764363

Break this problem into two subproblems by setting 
(x + -5) equal to 5.567764363 and -5.567764363.

Subproblem 1

x + -5 = 5.567764363 Simplifying x + -5 = 5.567764363 Reorder the terms: -5 + x = 5.567764363 Solving -5 + x = 5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.567764363 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.567764363 + 5 x = 5.567764363 + 5 Combine like terms: 5.567764363 + 5 = 10.567764363 x = 10.567764363 Simplifying x = 10.567764363

Subproblem 2

x + -5 = -5.567764363 Simplifying x + -5 = -5.567764363 Reorder the terms: -5 + x = -5.567764363 Solving -5 + x = -5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.567764363 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.567764363 + 5 x = -5.567764363 + 5 Combine like terms: -5.567764363 + 5 = -0.567764363 x = -0.567764363 Simplifying x = -0.567764363

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.567764363, -0.567764363}

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