s^2+7s=-18

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Solution for s^2+7s=-18 equation:


Simplifying
s2 + 7s = -18

Reorder the terms:
7s + s2 = -18

Solving
7s + s2 = -18

Solving for variable 's'.

Reorder the terms:
18 + 7s + s2 = -18 + 18

Combine like terms: -18 + 18 = 0
18 + 7s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + 7s + -18 + s2 = 0 + -18

Reorder the terms:
18 + -18 + 7s + s2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + 7s + s2 = 0 + -18
7s + s2 = 0 + -18

Combine like terms: 0 + -18 = -18
7s + s2 = -18

The s term is 7s.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7s + 12.25 + s2 = -18 + 12.25

Reorder the terms:
12.25 + 7s + s2 = -18 + 12.25

Combine like terms: -18 + 12.25 = -5.75
12.25 + 7s + s2 = -5.75

Factor a perfect square on the left side:
(s + 3.5)(s + 3.5) = -5.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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