5x^2+20x+12=0

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Solution for 5x^2+20x+12=0 equation:


Simplifying
5x2 + 20x + 12 = 0

Reorder the terms:
12 + 20x + 5x2 = 0

Solving
12 + 20x + 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 + 4x + x2 = 0

Move the constant term to the right:

Add '-2.4' to each side of the equation.
2.4 + 4x + -2.4 + x2 = 0 + -2.4

Reorder the terms:
2.4 + -2.4 + 4x + x2 = 0 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + 4x + x2 = 0 + -2.4
4x + x2 = 0 + -2.4

Combine like terms: 0 + -2.4 = -2.4
4x + x2 = -2.4

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -2.4 + 4

Reorder the terms:
4 + 4x + x2 = -2.4 + 4

Combine like terms: -2.4 + 4 = 1.6
4 + 4x + x2 = 1.6

Factor a perfect square on the left side:
(x + 2)(x + 2) = 1.6

Calculate the square root of the right side: 1.264911064

Break this problem into two subproblems by setting 
(x + 2) equal to 1.264911064 and -1.264911064.

Subproblem 1

x + 2 = 1.264911064 Simplifying x + 2 = 1.264911064 Reorder the terms: 2 + x = 1.264911064 Solving 2 + x = 1.264911064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 1.264911064 + -2 Combine like terms: 2 + -2 = 0 0 + x = 1.264911064 + -2 x = 1.264911064 + -2 Combine like terms: 1.264911064 + -2 = -0.735088936 x = -0.735088936 Simplifying x = -0.735088936

Subproblem 2

x + 2 = -1.264911064 Simplifying x + 2 = -1.264911064 Reorder the terms: 2 + x = -1.264911064 Solving 2 + x = -1.264911064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -1.264911064 + -2 Combine like terms: 2 + -2 = 0 0 + x = -1.264911064 + -2 x = -1.264911064 + -2 Combine like terms: -1.264911064 + -2 = -3.264911064 x = -3.264911064 Simplifying x = -3.264911064

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.735088936, -3.264911064}

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