10b^2+4b+9=0

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Solution for 10b^2+4b+9=0 equation:


Simplifying
10b2 + 4b + 9 = 0

Reorder the terms:
9 + 4b + 10b2 = 0

Solving
9 + 4b + 10b2 = 0

Solving for variable 'b'.

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

Divide each side by '10'.
0.9 + 0.4b + b2 = 0

Move the constant term to the right:

Add '-0.9' to each side of the equation.
0.9 + 0.4b + -0.9 + b2 = 0 + -0.9

Reorder the terms:
0.9 + -0.9 + 0.4b + b2 = 0 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + 0.4b + b2 = 0 + -0.9
0.4b + b2 = 0 + -0.9

Combine like terms: 0 + -0.9 = -0.9
0.4b + b2 = -0.9

The b term is 0.4b.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4b + 0.04 + b2 = -0.9 + 0.04

Reorder the terms:
0.04 + 0.4b + b2 = -0.9 + 0.04

Combine like terms: -0.9 + 0.04 = -0.86
0.04 + 0.4b + b2 = -0.86

Factor a perfect square on the left side:
(b + 0.2)(b + 0.2) = -0.86

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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