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= 1(3k)² + 2(3k)4l + 1(4l)²
= 9k² + 24kl + 16l²
= (3k+4l)(3k+4l)
= 3k.3k + 3k.4l + 4l.3k + 4l.4l
= 9k² + 12kl + 12kl + 16l²
= 9k² + 24kl + 16l²
jawabnya 9k² + 24 kl + 16l²