a^2+18a+85=0

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Solution for a^2+18a+85=0 equation:


Simplifying
a2 + 18a + 85 = 0

Reorder the terms:
85 + 18a + a2 = 0

Solving
85 + 18a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-85' to each side of the equation.
85 + 18a + -85 + a2 = 0 + -85

Reorder the terms:
85 + -85 + 18a + a2 = 0 + -85

Combine like terms: 85 + -85 = 0
0 + 18a + a2 = 0 + -85
18a + a2 = 0 + -85

Combine like terms: 0 + -85 = -85
18a + a2 = -85

The a term is 18a.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18a + 81 + a2 = -85 + 81

Reorder the terms:
81 + 18a + a2 = -85 + 81

Combine like terms: -85 + 81 = -4
81 + 18a + a2 = -4

Factor a perfect square on the left side:
(a + 9)(a + 9) = -4

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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