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Simplifying 4x2 + 15x + 85 = 0 Reorder the terms: 85 + 15x + 4x2 = 0 Solving 85 + 15x + 4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 21.25 + 3.75x + x2 = 0 Move the constant term to the right: Add '-21.25' to each side of the equation. 21.25 + 3.75x + -21.25 + x2 = 0 + -21.25 Reorder the terms: 21.25 + -21.25 + 3.75x + x2 = 0 + -21.25 Combine like terms: 21.25 + -21.25 = 0.00 0.00 + 3.75x + x2 = 0 + -21.25 3.75x + x2 = 0 + -21.25 Combine like terms: 0 + -21.25 = -21.25 3.75x + x2 = -21.25 The x term is 3.75x. Take half its coefficient (1.875). Square it (3.515625) and add it to both sides. Add '3.515625' to each side of the equation. 3.75x + 3.515625 + x2 = -21.25 + 3.515625 Reorder the terms: 3.515625 + 3.75x + x2 = -21.25 + 3.515625 Combine like terms: -21.25 + 3.515625 = -17.734375 3.515625 + 3.75x + x2 = -17.734375 Factor a perfect square on the left side: (x + 1.875)(x + 1.875) = -17.734375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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