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Simplifying 2x2 + 5x + 990 = 0 Reorder the terms: 990 + 5x + 2x2 = 0 Solving 990 + 5x + 2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 495 + 2.5x + x2 = 0 Move the constant term to the right: Add '-495' to each side of the equation. 495 + 2.5x + -495 + x2 = 0 + -495 Reorder the terms: 495 + -495 + 2.5x + x2 = 0 + -495 Combine like terms: 495 + -495 = 0 0 + 2.5x + x2 = 0 + -495 2.5x + x2 = 0 + -495 Combine like terms: 0 + -495 = -495 2.5x + x2 = -495 The x term is 2.5x. Take half its coefficient (1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. 2.5x + 1.5625 + x2 = -495 + 1.5625 Reorder the terms: 1.5625 + 2.5x + x2 = -495 + 1.5625 Combine like terms: -495 + 1.5625 = -493.4375 1.5625 + 2.5x + x2 = -493.4375 Factor a perfect square on the left side: (x + 1.25)(x + 1.25) = -493.4375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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