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Simplifying (u + 4)(u + -4) = 0 Reorder the terms: (4 + u)(u + -4) = 0 Reorder the terms: (4 + u)(-4 + u) = 0 Multiply (4 + u) * (-4 + u) (4(-4 + u) + u(-4 + u)) = 0 ((-4 * 4 + u * 4) + u(-4 + u)) = 0 ((-16 + 4u) + u(-4 + u)) = 0 (-16 + 4u + (-4 * u + u * u)) = 0 (-16 + 4u + (-4u + u2)) = 0 Combine like terms: 4u + -4u = 0 (-16 + 0 + u2) = 0 (-16 + u2) = 0 Solving -16 + u2 = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + u2 = 0 + 16 Combine like terms: -16 + 16 = 0 0 + u2 = 0 + 16 u2 = 0 + 16 Combine like terms: 0 + 16 = 16 u2 = 16 Simplifying u2 = 16 Take the square root of each side: u = {-4, 4}
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