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Simplifying -1z2 + 6z + -25 = 0 Reorder the terms: -25 + 6z + -1z2 = 0 Solving -25 + 6z + -1z2 = 0 Solving for variable 'z'. Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 25 + -6z + z2 = 0 Move the constant term to the right: Add '-25' to each side of the equation. 25 + -6z + -25 + z2 = 0 + -25 Reorder the terms: 25 + -25 + -6z + z2 = 0 + -25 Combine like terms: 25 + -25 = 0 0 + -6z + z2 = 0 + -25 -6z + z2 = 0 + -25 Combine like terms: 0 + -25 = -25 -6z + z2 = -25 The z term is -6z. Take half its coefficient (-3). Square it (9) and add it to both sides. Add '9' to each side of the equation. -6z + 9 + z2 = -25 + 9 Reorder the terms: 9 + -6z + z2 = -25 + 9 Combine like terms: -25 + 9 = -16 9 + -6z + z2 = -16 Factor a perfect square on the left side: (z + -3)(z + -3) = -16 Can't calculate square root of the right side. The solution to this equation could not be determined.
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