5b^2+18b+36=0

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Solution for 5b^2+18b+36=0 equation:


Simplifying
5b2 + 18b + 36 = 0

Reorder the terms:
36 + 18b + 5b2 = 0

Solving
36 + 18b + 5b2 = 0

Solving for variable 'b'.

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

Divide each side by '5'.
7.2 + 3.6b + b2 = 0

Move the constant term to the right:

Add '-7.2' to each side of the equation.
7.2 + 3.6b + -7.2 + b2 = 0 + -7.2

Reorder the terms:
7.2 + -7.2 + 3.6b + b2 = 0 + -7.2

Combine like terms: 7.2 + -7.2 = 0.0
0.0 + 3.6b + b2 = 0 + -7.2
3.6b + b2 = 0 + -7.2

Combine like terms: 0 + -7.2 = -7.2
3.6b + b2 = -7.2

The b term is 3.6b.  Take half its coefficient (1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
3.6b + 3.24 + b2 = -7.2 + 3.24

Reorder the terms:
3.24 + 3.6b + b2 = -7.2 + 3.24

Combine like terms: -7.2 + 3.24 = -3.96
3.24 + 3.6b + b2 = -3.96

Factor a perfect square on the left side:
(b + 1.8)(b + 1.8) = -3.96

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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