5x^2+15x+12=0

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Solution for 5x^2+15x+12=0 equation:


Simplifying
5x2 + 15x + 12 = 0

Reorder the terms:
12 + 15x + 5x2 = 0

Solving
12 + 15x + 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 + 3x + x2 = 0

Move the constant term to the right:

Add '-2.4' to each side of the equation.
2.4 + 3x + -2.4 + x2 = 0 + -2.4

Reorder the terms:
2.4 + -2.4 + 3x + x2 = 0 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + 3x + x2 = 0 + -2.4
3x + x2 = 0 + -2.4

Combine like terms: 0 + -2.4 = -2.4
3x + x2 = -2.4

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = -2.4 + 2.25

Reorder the terms:
2.25 + 3x + x2 = -2.4 + 2.25

Combine like terms: -2.4 + 2.25 = -0.15
2.25 + 3x + x2 = -0.15

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = -0.15

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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