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Simplifying 2r2 + -6r = -8 Reorder the terms: -6r + 2r2 = -8 Solving -6r + 2r2 = -8 Solving for variable 'r'. Reorder the terms: 8 + -6r + 2r2 = -8 + 8 Combine like terms: -8 + 8 = 0 8 + -6r + 2r2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(4 + -3r + r2) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(4 + -3r + r2)' equal to zero and attempt to solve: Simplifying 4 + -3r + r2 = 0 Solving 4 + -3r + r2 = 0 Begin completing the square. Move the constant term to the right: Add '-4' to each side of the equation. 4 + -3r + -4 + r2 = 0 + -4 Reorder the terms: 4 + -4 + -3r + r2 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -3r + r2 = 0 + -4 -3r + r2 = 0 + -4 Combine like terms: 0 + -4 = -4 -3r + r2 = -4 The r term is -3r. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3r + 2.25 + r2 = -4 + 2.25 Reorder the terms: 2.25 + -3r + r2 = -4 + 2.25 Combine like terms: -4 + 2.25 = -1.75 2.25 + -3r + r2 = -1.75 Factor a perfect square on the left side: (r + -1.5)(r + -1.5) = -1.75 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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