0=-4x^2-3x-9

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Solution for 0=-4x^2-3x-9 equation:


Simplifying
0 = -4x2 + -3x + -9

Reorder the terms:
0 = -9 + -3x + -4x2

Solving
0 = -9 + -3x + -4x2

Solving for variable 'x'.

Combine like terms: 0 + 9 = 9
9 + 3x + 4x2 = -9 + -3x + -4x2 + 9 + 3x + 4x2

Reorder the terms:
9 + 3x + 4x2 = -9 + 9 + -3x + 3x + -4x2 + 4x2

Combine like terms: -9 + 9 = 0
9 + 3x + 4x2 = 0 + -3x + 3x + -4x2 + 4x2
9 + 3x + 4x2 = -3x + 3x + -4x2 + 4x2

Combine like terms: -3x + 3x = 0
9 + 3x + 4x2 = 0 + -4x2 + 4x2
9 + 3x + 4x2 = -4x2 + 4x2

Combine like terms: -4x2 + 4x2 = 0
9 + 3x + 4x2 = 0

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

Divide each side by '4'.
2.25 + 0.75x + x2 = 0

Move the constant term to the right:

Add '-2.25' to each side of the equation.
2.25 + 0.75x + -2.25 + x2 = 0 + -2.25

Reorder the terms:
2.25 + -2.25 + 0.75x + x2 = 0 + -2.25

Combine like terms: 2.25 + -2.25 = 0.00
0.00 + 0.75x + x2 = 0 + -2.25
0.75x + x2 = 0 + -2.25

Combine like terms: 0 + -2.25 = -2.25
0.75x + x2 = -2.25

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = -2.25 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = -2.25 + 0.140625

Combine like terms: -2.25 + 0.140625 = -2.109375
0.140625 + 0.75x + x2 = -2.109375

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = -2.109375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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