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Simplifying 4x2 + -15x + 21 = 0 Reorder the terms: 21 + -15x + 4x2 = 0 Solving 21 + -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'. 5.25 + -3.75x + x2 = 0 Move the constant term to the right: Add '-5.25' to each side of the equation. 5.25 + -3.75x + -5.25 + x2 = 0 + -5.25 Reorder the terms: 5.25 + -5.25 + -3.75x + x2 = 0 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + -3.75x + x2 = 0 + -5.25 -3.75x + x2 = 0 + -5.25 Combine like terms: 0 + -5.25 = -5.25 -3.75x + x2 = -5.25 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 = -5.25 + 3.515625 Reorder the terms: 3.515625 + -3.75x + x2 = -5.25 + 3.515625 Combine like terms: -5.25 + 3.515625 = -1.734375 3.515625 + -3.75x + x2 = -1.734375 Factor a perfect square on the left side: (x + -1.875)(x + -1.875) = -1.734375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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