5x^2+9=-x

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Solution for 5x^2+9=-x equation:


Simplifying
5x2 + 9 = -1x

Reorder the terms:
9 + 5x2 = -1x

Solving
9 + 5x2 = -1x

Solving for variable 'x'.

Reorder the terms:
9 + x + 5x2 = -1x + x

Combine like terms: -1x + x = 0
9 + x + 5x2 = 0

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

Divide each side by '5'.
1.8 + 0.2x + x2 = 0

Move the constant term to the right:

Add '-1.8' to each side of the equation.
1.8 + 0.2x + -1.8 + x2 = 0 + -1.8

Reorder the terms:
1.8 + -1.8 + 0.2x + x2 = 0 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + 0.2x + x2 = 0 + -1.8
0.2x + x2 = 0 + -1.8

Combine like terms: 0 + -1.8 = -1.8
0.2x + x2 = -1.8

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.2x + 0.25 + x2 = -1.8 + 0.25

Reorder the terms:
0.25 + 0.2x + x2 = -1.8 + 0.25

Combine like terms: -1.8 + 0.25 = -1.55
0.25 + 0.2x + x2 = -1.55

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -1.55

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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