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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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