7=-3x^2-x

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Solution for 7=-3x^2-x equation: 


Simplifying
7 = -3x2 + -1x

Reorder the terms:
7 = -1x + -3x2

Solving
7 = -1x + -3x2

Solving for variable 'x'.

Reorder the terms:
7 + x + 3x2 = -1x + x + -3x2 + 3x2

Combine like terms: -1x + x = 0
7 + x + 3x2 = 0 + -3x2 + 3x2
7 + x + 3x2 = -3x2 + 3x2

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

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

Divide each side by '3'.
2.333333333 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '-2.333333333' to each side of the equation.
2.333333333 + 0.3333333333x + -2.333333333 + x2 = 0 + -2.333333333

Reorder the terms:
2.333333333 + -2.333333333 + 0.3333333333x + x2 = 0 + -2.333333333

Combine like terms: 2.333333333 + -2.333333333 = 0.000000000
0.000000000 + 0.3333333333x + x2 = 0 + -2.333333333
0.3333333333x + x2 = 0 + -2.333333333

Combine like terms: 0 + -2.333333333 = -2.333333333
0.3333333333x + x2 = -2.333333333

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.
0.3333333333x + 0.25 + x2 = -2.333333333 + 0.25

Reorder the terms:
0.25 + 0.3333333333x + x2 = -2.333333333 + 0.25

Combine like terms: -2.333333333 + 0.25 = -2.083333333
0.25 + 0.3333333333x + x2 = -2.083333333

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -2.083333333

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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