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Simplifying -72 + -1a + -1a2 = 0 Solving -72 + -1a + -1a2 = 0 Solving for variable 'a'. Factor out the Greatest Common Factor (GCF), '-1'. -1(72 + a + a2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(72 + a + a2)' equal to zero and attempt to solve: Simplifying 72 + a + a2 = 0 Solving 72 + a + a2 = 0 Begin completing the square. Move the constant term to the right: Add '-72' to each side of the equation. 72 + a + -72 + a2 = 0 + -72 Reorder the terms: 72 + -72 + a + a2 = 0 + -72 Combine like terms: 72 + -72 = 0 0 + a + a2 = 0 + -72 a + a2 = 0 + -72 Combine like terms: 0 + -72 = -72 a + a2 = -72 The a term is a. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. a + 0.25 + a2 = -72 + 0.25 Reorder the terms: 0.25 + a + a2 = -72 + 0.25 Combine like terms: -72 + 0.25 = -71.75 0.25 + a + a2 = -71.75 Factor a perfect square on the left side: (a + 0.5)(a + 0.5) = -71.75 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.
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