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Simplifying 9n + 56 = 7n + -2n(n + -2) Reorder the terms: 56 + 9n = 7n + -2n(n + -2) Reorder the terms: 56 + 9n = 7n + -2n(-2 + n) 56 + 9n = 7n + (-2 * -2n + n * -2n) 56 + 9n = 7n + (4n + -2n2) Combine like terms: 7n + 4n = 11n 56 + 9n = 11n + -2n2 Solving 56 + 9n = 11n + -2n2 Solving for variable 'n'. Combine like terms: 9n + -11n = -2n 56 + -2n + 2n2 = 11n + -2n2 + -11n + 2n2 Reorder the terms: 56 + -2n + 2n2 = 11n + -11n + -2n2 + 2n2 Combine like terms: 11n + -11n = 0 56 + -2n + 2n2 = 0 + -2n2 + 2n2 56 + -2n + 2n2 = -2n2 + 2n2 Combine like terms: -2n2 + 2n2 = 0 56 + -2n + 2n2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(28 + -1n + n2) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(28 + -1n + n2)' equal to zero and attempt to solve: Simplifying 28 + -1n + n2 = 0 Solving 28 + -1n + n2 = 0 Begin completing the square. Move the constant term to the right: Add '-28' to each side of the equation. 28 + -1n + -28 + n2 = 0 + -28 Reorder the terms: 28 + -28 + -1n + n2 = 0 + -28 Combine like terms: 28 + -28 = 0 0 + -1n + n2 = 0 + -28 -1n + n2 = 0 + -28 Combine like terms: 0 + -28 = -28 -1n + n2 = -28 The n term is -1n. 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. -1n + 0.25 + n2 = -28 + 0.25 Reorder the terms: 0.25 + -1n + n2 = -28 + 0.25 Combine like terms: -28 + 0.25 = -27.75 0.25 + -1n + n2 = -27.75 Factor a perfect square on the left side: (n + -0.5)(n + -0.5) = -27.75 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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