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Simplifying D2 + 4d + -21 = 0 Reorder the terms: -21 + D2 + 4d = 0 Solving -21 + D2 + 4d = 0 Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '21' to each side of the equation. -21 + D2 + 21 + 4d = 0 + 21 Reorder the terms: -21 + 21 + D2 + 4d = 0 + 21 Combine like terms: -21 + 21 = 0 0 + D2 + 4d = 0 + 21 D2 + 4d = 0 + 21 Combine like terms: 0 + 21 = 21 D2 + 4d = 21 Add '-4d' to each side of the equation. D2 + 4d + -4d = 21 + -4d Combine like terms: 4d + -4d = 0 D2 + 0 = 21 + -4d D2 = 21 + -4d Simplifying D2 = 21 + -4d Reorder the terms: -21 + D2 + 4d = 21 + -4d + -21 + 4d Reorder the terms: -21 + D2 + 4d = 21 + -21 + -4d + 4d Combine like terms: 21 + -21 = 0 -21 + D2 + 4d = 0 + -4d + 4d -21 + D2 + 4d = -4d + 4d Combine like terms: -4d + 4d = 0 -21 + D2 + 4d = 0 The solution to this equation could not be determined.
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