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Simplifying 4r2 + -8r + 18 = 0 Reorder the terms: 18 + -8r + 4r2 = 0 Solving 18 + -8r + 4r2 = 0 Solving for variable 'r'. Factor out the Greatest Common Factor (GCF), '2'. 2(9 + -4r + 2r2) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(9 + -4r + 2r2)' equal to zero and attempt to solve: Simplifying 9 + -4r + 2r2 = 0 Solving 9 + -4r + 2r2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 4.5 + -2r + r2 = 0 Move the constant term to the right: Add '-4.5' to each side of the equation. 4.5 + -2r + -4.5 + r2 = 0 + -4.5 Reorder the terms: 4.5 + -4.5 + -2r + r2 = 0 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + -2r + r2 = 0 + -4.5 -2r + r2 = 0 + -4.5 Combine like terms: 0 + -4.5 = -4.5 -2r + r2 = -4.5 The r term is -2r. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2r + 1 + r2 = -4.5 + 1 Reorder the terms: 1 + -2r + r2 = -4.5 + 1 Combine like terms: -4.5 + 1 = -3.5 1 + -2r + r2 = -3.5 Factor a perfect square on the left side: (r + -1)(r + -1) = -3.5 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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