-5x^2-10x+12=0

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Solution for -5x^2-10x+12=0 equation:


Simplifying
-5x2 + -10x + 12 = 0

Reorder the terms:
12 + -10x + -5x2 = 0

Solving
12 + -10x + -5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-2.4 + 2x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + 2x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + 2x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + 2x + x2 = 0 + 2.4
2x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
2x + x2 = 2.4

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 2.4 + 1

Reorder the terms:
1 + 2x + x2 = 2.4 + 1

Combine like terms: 2.4 + 1 = 3.4
1 + 2x + x2 = 3.4

Factor a perfect square on the left side:
(x + 1)(x + 1) = 3.4

Calculate the square root of the right side: 1.843908891

Break this problem into two subproblems by setting 
(x + 1) equal to 1.843908891 and -1.843908891.

Subproblem 1

x + 1 = 1.843908891 Simplifying x + 1 = 1.843908891 Reorder the terms: 1 + x = 1.843908891 Solving 1 + x = 1.843908891 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.843908891 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.843908891 + -1 x = 1.843908891 + -1 Combine like terms: 1.843908891 + -1 = 0.843908891 x = 0.843908891 Simplifying x = 0.843908891

Subproblem 2

x + 1 = -1.843908891 Simplifying x + 1 = -1.843908891 Reorder the terms: 1 + x = -1.843908891 Solving 1 + x = -1.843908891 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.843908891 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.843908891 + -1 x = -1.843908891 + -1 Combine like terms: -1.843908891 + -1 = -2.843908891 x = -2.843908891 Simplifying x = -2.843908891

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.843908891, -2.843908891}

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