8x^2+4x=-9

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Solution for 8x^2+4x=-9 equation:


Simplifying
8x2 + 4x = -9

Reorder the terms:
4x + 8x2 = -9

Solving
4x + 8x2 = -9

Solving for variable 'x'.

Reorder the terms:
9 + 4x + 8x2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + 4x + 8x2 = 0

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

Divide each side by '8'.
1.125 + 0.5x + x2 = 0

Move the constant term to the right:

Add '-1.125' to each side of the equation.
1.125 + 0.5x + -1.125 + x2 = 0 + -1.125

Reorder the terms:
1.125 + -1.125 + 0.5x + x2 = 0 + -1.125

Combine like terms: 1.125 + -1.125 = 0.000
0.000 + 0.5x + x2 = 0 + -1.125
0.5x + x2 = 0 + -1.125

Combine like terms: 0 + -1.125 = -1.125
0.5x + x2 = -1.125

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = -1.125 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = -1.125 + 0.0625

Combine like terms: -1.125 + 0.0625 = -1.0625
0.0625 + 0.5x + x2 = -1.0625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = -1.0625

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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