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Simplifying 0 = a(a + 4) Reorder the terms: 0 = a(4 + a) 0 = (4 * a + a * a) 0 = (4a + a2) Solving 0 = 4a + a2 Solving for variable 'a'. Remove the zero: -4a + -1a2 = 4a + a2 + -4a + -1a2 Reorder the terms: -4a + -1a2 = 4a + -4a + a2 + -1a2 Combine like terms: 4a + -4a = 0 -4a + -1a2 = 0 + a2 + -1a2 -4a + -1a2 = a2 + -1a2 Combine like terms: a2 + -1a2 = 0 -4a + -1a2 = 0 Factor out the Greatest Common Factor (GCF), '-1a'. -1a(4 + a) = 0 Ignore the factor -1.Subproblem 1
Set the factor 'a' equal to zero and attempt to solve: Simplifying a = 0 Solving a = 0 Move all terms containing a to the left, all other terms to the right. Simplifying a = 0Subproblem 2
Set the factor '(4 + a)' equal to zero and attempt to solve: Simplifying 4 + a = 0 Solving 4 + a = 0 Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + a = 0 + -4 a = 0 + -4 Combine like terms: 0 + -4 = -4 a = -4 Simplifying a = -4Solution
a = {0, -4}
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