4t² + 36t + 81 = 2²t² + 2 * 2t * 9 + 9² = (2t)² + 2 * 2t * 9 + 9² = (2t - 9)²
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4t² + 36t + 81 = 2²t² + 2 * 2t * 9 + 9² = (2t)² + 2 * 2t * 9 + 9² = (2t - 9)²