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Simplifying (u + -3)(u + 3) = 0 Reorder the terms: (-3 + u)(u + 3) = 0 Reorder the terms: (-3 + u)(3 + u) = 0 Multiply (-3 + u) * (3 + u) (-3(3 + u) + u(3 + u)) = 0 ((3 * -3 + u * -3) + u(3 + u)) = 0 ((-9 + -3u) + u(3 + u)) = 0 (-9 + -3u + (3 * u + u * u)) = 0 (-9 + -3u + (3u + u2)) = 0 Combine like terms: -3u + 3u = 0 (-9 + 0 + u2) = 0 (-9 + u2) = 0 Solving -9 + u2 = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + u2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + u2 = 0 + 9 u2 = 0 + 9 Combine like terms: 0 + 9 = 9 u2 = 9 Simplifying u2 = 9 Take the square root of each side: u = {-3, 3}
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