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velikii [3]
2 years ago
10

Perfect square trinomial:

Mathematics
1 answer:
Alina [70]2 years ago
6 0

Answer:

See work below.

Step-by-step explanation:

(k-9)^2=(k-9)(k-9)\\=k^2-2(k)(9)+9^2\\=k^2-18k+81

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