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Simplifying -1r2 + -1r + -7 = 0 Reorder the terms: -7 + -1r + -1r2 = 0 Solving -7 + -1r + -1r2 = 0 Solving for variable 'r'. Factor out the Greatest Common Factor (GCF), '-1'. -1(7 + r + r2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(7 + r + r2)' equal to zero and attempt to solve: Simplifying 7 + r + r2 = 0 Solving 7 + r + r2 = 0 Begin completing the square. Move the constant term to the right: Add '-7' to each side of the equation. 7 + r + -7 + r2 = 0 + -7 Reorder the terms: 7 + -7 + r + r2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + r + r2 = 0 + -7 r + r2 = 0 + -7 Combine like terms: 0 + -7 = -7 r + r2 = -7 The r term is r. 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. r + 0.25 + r2 = -7 + 0.25 Reorder the terms: 0.25 + r + r2 = -7 + 0.25 Combine like terms: -7 + 0.25 = -6.75 0.25 + r + r2 = -6.75 Factor a perfect square on the left side: (r + 0.5)(r + 0.5) = -6.75 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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