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Simplifying 2 * 4z + -20 + -1z2 = 0 Multiply 2 * 4 8z + -20 + -1z2 = 0 Reorder the terms: -20 + 8z + -1z2 = 0 Solving -20 + 8z + -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'. 20 + -8z + z2 = 0 Move the constant term to the right: Add '-20' to each side of the equation. 20 + -8z + -20 + z2 = 0 + -20 Reorder the terms: 20 + -20 + -8z + z2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -8z + z2 = 0 + -20 -8z + z2 = 0 + -20 Combine like terms: 0 + -20 = -20 -8z + z2 = -20 The z term is -8z. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8z + 16 + z2 = -20 + 16 Reorder the terms: 16 + -8z + z2 = -20 + 16 Combine like terms: -20 + 16 = -4 16 + -8z + z2 = -4 Factor a perfect square on the left side: (z + -4)(z + -4) = -4 Can't calculate square root of the right side. The solution to this equation could not be determined.
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