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Simplifying -1x2 + 10x + -28 = 0 Reorder the terms: -28 + 10x + -1x2 = 0 Solving -28 + 10x + -1x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 28 + -10x + x2 = 0 Move the constant term to the right: Add '-28' to each side of the equation. 28 + -10x + -28 + x2 = 0 + -28 Reorder the terms: 28 + -28 + -10x + x2 = 0 + -28 Combine like terms: 28 + -28 = 0 0 + -10x + x2 = 0 + -28 -10x + x2 = 0 + -28 Combine like terms: 0 + -28 = -28 -10x + x2 = -28 The x term is -10x. Take half its coefficient (-5). Square it (25) and add it to both sides. Add '25' to each side of the equation. -10x + 25 + x2 = -28 + 25 Reorder the terms: 25 + -10x + x2 = -28 + 25 Combine like terms: -28 + 25 = -3 25 + -10x + x2 = -3 Factor a perfect square on the left side: (x + -5)(x + -5) = -3 Can't calculate square root of the right side. The solution to this equation could not be determined.
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