s^2+3s=-18

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Solution for s^2+3s=-18 equation:


Simplifying
s2 + 3s = -18

Reorder the terms:
3s + s2 = -18

Solving
3s + s2 = -18

Solving for variable 's'.

Reorder the terms:
18 + 3s + s2 = -18 + 18

Combine like terms: -18 + 18 = 0
18 + 3s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + 3s + -18 + s2 = 0 + -18

Reorder the terms:
18 + -18 + 3s + s2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + 3s + s2 = 0 + -18
3s + s2 = 0 + -18

Combine like terms: 0 + -18 = -18
3s + s2 = -18

The s term is 3s.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3s + 2.25 + s2 = -18 + 2.25

Reorder the terms:
2.25 + 3s + s2 = -18 + 2.25

Combine like terms: -18 + 2.25 = -15.75
2.25 + 3s + s2 = -15.75

Factor a perfect square on the left side:
(s + 1.5)(s + 1.5) = -15.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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