2X^2+6X+15=0

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Solution for 2X^2+6X+15=0 equation:


Simplifying
2X2 + 6X + 15 = 0

Reorder the terms:
15 + 6X + 2X2 = 0

Solving
15 + 6X + 2X2 = 0

Solving for variable 'X'.

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

Divide each side by '2'.
7.5 + 3X + X2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + 3X + -7.5 + X2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + 3X + X2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + 3X + X2 = 0 + -7.5
3X + X2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
3X + X2 = -7.5

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 = -7.5 + 2.25

Reorder the terms:
2.25 + 3X + X2 = -7.5 + 2.25

Combine like terms: -7.5 + 2.25 = -5.25
2.25 + 3X + X2 = -5.25

Factor a perfect square on the left side:
(X + 1.5)(X + 1.5) = -5.25

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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