5x^2+40x+12=0

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Solution for 5x^2+40x+12=0 equation:


Simplifying
5x2 + 40x + 12 = 0

Reorder the terms:
12 + 40x + 5x2 = 0

Solving
12 + 40x + 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 + 8x + x2 = 0

Move the constant term to the right:

Add '-2.4' to each side of the equation.
2.4 + 8x + -2.4 + x2 = 0 + -2.4

Reorder the terms:
2.4 + -2.4 + 8x + x2 = 0 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + 8x + x2 = 0 + -2.4
8x + x2 = 0 + -2.4

Combine like terms: 0 + -2.4 = -2.4
8x + x2 = -2.4

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = -2.4 + 16

Reorder the terms:
16 + 8x + x2 = -2.4 + 16

Combine like terms: -2.4 + 16 = 13.6
16 + 8x + x2 = 13.6

Factor a perfect square on the left side:
(x + 4)(x + 4) = 13.6

Calculate the square root of the right side: 3.687817783

Break this problem into two subproblems by setting 
(x + 4) equal to 3.687817783 and -3.687817783.

Subproblem 1

x + 4 = 3.687817783 Simplifying x + 4 = 3.687817783 Reorder the terms: 4 + x = 3.687817783 Solving 4 + x = 3.687817783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 3.687817783 + -4 Combine like terms: 4 + -4 = 0 0 + x = 3.687817783 + -4 x = 3.687817783 + -4 Combine like terms: 3.687817783 + -4 = -0.312182217 x = -0.312182217 Simplifying x = -0.312182217

Subproblem 2

x + 4 = -3.687817783 Simplifying x + 4 = -3.687817783 Reorder the terms: 4 + x = -3.687817783 Solving 4 + x = -3.687817783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -3.687817783 + -4 Combine like terms: 4 + -4 = 0 0 + x = -3.687817783 + -4 x = -3.687817783 + -4 Combine like terms: -3.687817783 + -4 = -7.687817783 x = -7.687817783 Simplifying x = -7.687817783

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.312182217, -7.687817783}

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