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Simplifying 2a2 + 8a = -18 Reorder the terms: 8a + 2a2 = -18 Solving 8a + 2a2 = -18 Solving for variable 'a'. Reorder the terms: 18 + 8a + 2a2 = -18 + 18 Combine like terms: -18 + 18 = 0 18 + 8a + 2a2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(9 + 4a + a2) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(9 + 4a + a2)' equal to zero and attempt to solve: Simplifying 9 + 4a + a2 = 0 Solving 9 + 4a + a2 = 0 Begin completing the square. Move the constant term to the right: Add '-9' to each side of the equation. 9 + 4a + -9 + a2 = 0 + -9 Reorder the terms: 9 + -9 + 4a + a2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 4a + a2 = 0 + -9 4a + a2 = 0 + -9 Combine like terms: 0 + -9 = -9 4a + a2 = -9 The a term is 4a. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4a + 4 + a2 = -9 + 4 Reorder the terms: 4 + 4a + a2 = -9 + 4 Combine like terms: -9 + 4 = -5 4 + 4a + a2 = -5 Factor a perfect square on the left side: (a + 2)(a + 2) = -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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