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Simplifying d2 + 5d + 66 = 0 Reorder the terms: 66 + 5d + d2 = 0 Solving 66 + 5d + d2 = 0 Solving for variable 'd'. Begin completing the square. Move the constant term to the right: Add '-66' to each side of the equation. 66 + 5d + -66 + d2 = 0 + -66 Reorder the terms: 66 + -66 + 5d + d2 = 0 + -66 Combine like terms: 66 + -66 = 0 0 + 5d + d2 = 0 + -66 5d + d2 = 0 + -66 Combine like terms: 0 + -66 = -66 5d + d2 = -66 The d term is 5d. Take half its coefficient (2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. 5d + 6.25 + d2 = -66 + 6.25 Reorder the terms: 6.25 + 5d + d2 = -66 + 6.25 Combine like terms: -66 + 6.25 = -59.75 6.25 + 5d + d2 = -59.75 Factor a perfect square on the left side: (d + 2.5)(d + 2.5) = -59.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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